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Girodisc A1-220 Two Piece Floating Front Racing Brake Rotors Girodisc Rotors to Replace the Front Rotors on the Following Cars: BMW F80 M3 including CS with optional carbon ceramic brake package (gold calipers) BMW F82 M4 including CS with optional carbon ceramic brake package (gold calipers) BMW F87 M2, M2 Competition & M2 CS with red or silver calipers BMW F87 M2 CS with optional carbon ceramic brake package (gold calipers) High Performance Brake Rotors to Replace Your Fragile BMW Rotors Whether you have a BMW M2 with red or silver calipers and drilled rotors or a BMW M2, M3, or M4 with gold calipers and the OEM CCB, this Girodisc floating iron rotor system is a direct replacement for your BMW front rotors. No modifications to your car are necessary. The 400mm diameter rotors will bolt directly to your BMW and work with the original red, silver, or gold calipers (depending on your model) perfectly. By upgrading your BMW CCB brakes with lightweight high performance iron replacements, your factory bias is maintained as well as your ABS efficiency. The central hat section of the Girodisc rotor is made from strictly U.S. sourced 6061-T6 aircraft specification aluminum. The disc is made from Girodisc's proprietary American-made cast iron and machined from start to finish in house at Girodisc. The disc utilizes a curved vane design, developed in racing to act as a centrifugal pump forcing cooling air through the disc. The disc and hat are joined by a floating mount system using 12 high-strength alloy steel drive pins manufactured by Girodisc in the USA and cadmium plated for long-lasting corrosion resistance. The drive pins bear the braking load while maintaining the axial and radial float between the hat and disc. The pins are secured by class 12.9 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side, allowing the rotor to grow with heat expansion while eliminating the rattle typically associated with floating rotors. A floating rotor will also self-center between the pads. Once your Girodisc system is in place, you can simply replace the cast iron discs as needed. Sold/priced per pair.

Thunderhill is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline. Fits Audi B9 RS5 The GiroDisc system is a direct replacement for the OEM brake disc. The 2-piece floating disc will bolt directly to the car and work with OEM calipers perfectly. By upgrading your brakes with these lightweight high-performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The Giro Disc rotors are lighter than OEM pieces. The reduction in rotational and unsprung weight allows for quicker acceleration and suspension response. When used with Pagid or PFC performance brake pads, and Thunderhill RF-1 brake fluid (also available from CompetitionMotorsport.com), you have an amazing solution to overheating, cracking and warping rotors. The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc. The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance. The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat. The pins are secured by grade12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.

Thunderhill is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline. Fits Chevrolet C6 ZR1 The GiroDisc system is a direct replacement for the OEM brake disc. The 2-piece floating disc will bolt directly to the car and work with OEM calipers perfectly. By upgrading your brakes with these lightweight high-performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The Giro Disc rotors are lighter than OEM pieces. The reduction in rotational and unsprung weight allows for quicker acceleration and suspension response. When used with Pagid or PFC performance brake pads, and Thunderhill RF-1 brake fluid (also available from CompetitionMotorsport.com), you have an amazing solution to overheating, cracking and warping rotors. The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc. The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance. The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat. The pins are secured by grade12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.

Thunderhill is an authorized dealer for Girodisc products. As one of the largest stocking dealers in the country, we ship most Girodisc products the same or next business day to ensure we meet your delivery deadline. Fits Nissan GT-R (R35, 2007+) The Girodisc system is a direct replacement for the OE disc. No modifications are necessary. The disc will bolt directly to the car and work with OE calipers perfectly. By upgrading your brakes with lightweight high performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. These Girodisc rear rotors are approx 18.8 lbs. This reduction in rotational and unsprung weight allows for quicker acceleration and suspension response. The central hat section of the Girodisc rotor is made from strictly USA-sourced 6061-T6 aircraft specification aluminum. The disc is made from Girodisc's own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes a curved-vane design, developed in racing to act as a centrifugal pump forcing cool air through the disc. The disc and hat have a floating mount system, which utilizes 12 high-strength alloy steel drive pins, manufactured in the US by Girodisc and cadmium plated for long-lasting corrosion resistance. These pins take the loads from braking while maintaining the axial and radial float between the hat and disc. They are secured by class 12.9 cap screws and hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise springs on the disc side, allowing the iron disc to expand as it heats up while eliminating the rattle and noise commonly associated with floating rotors. This float also allows the rotor to self center between the brake pads. Once the Girodisc system is in place, you simply replace the cast iron discs when needed. This reduces cost over time by allowing you to re-use the aluminum central hats. Sold/priced per pair

Sparco Circuit Carbon Fiber Racing Seats (Circuit II QRT) - Large    Hey Speed Demons and Track Day Titans!  Get ready to buckle up in the Sparco Circuit Carbon Fiber Racing Seat (Circuit II QRT), where cutting-edge technology meets the thrill of the race. This isn't just a seat; it's your throne as you conquer the track! Why It's Not Just a Seat, It's a Game-Changer: Ultralight Pre-Preg Carbon Fiber Shell: Imagine strapping into a seat so light yet so strong, it feels like it's from the future. Thanks to aerospace-grade carbon fiber, this seat is like wearing a feather - if the feather was also indestructible. Wider is Better: The Circuit II Carbon is the Arnold Schwarzenegger of racing seats - a wider version of its sibling, ensuring that even the burliest racers up to a 36” waist fit comfortably. Safety First, But Make It Stylish: With integrated bolsters for head protection and compatibility with FHR devices, it's like having a personal bodyguard, but way cooler. Feel the Grip: High grip material in strategic places means you're glued in place, even if you're pulling Gs like you're in a fighter jet. Fire-Resistant Fabric: Because the only thing that should be on fire is your lap time. Special Non-Slip Fabric: It's like the seat is giving you a reassuring hug, saying, "I got you," as you take those corners at breakneck speeds. FIA 8859-1999 Approved: This seat doesn't just meet standards; it laps them. QRT Technology - Because Weight Matters: Developed in Sparco's top-secret Italian lab (probably next to a gelato shop), QRT technology is like alchemy for seats. It magically reduces weight by up to 30% compared to others. Lighter seat, faster you! Feel the Experience: Imagine sliding into this seat. You're not just sitting; you're being cradled by cutting-edge technology. As you grip the wheel, the non-slip fabric grips you back. You're one with the car. Each turn, each lap, you're not just driving; you're performing a high-speed ballet, and the Circuit II QRT is your dance partner. Specifications: Ultralight Pre-Preg Carbon Fiber Shell Excellent Ergonomics for Comfort and Control Fire-Retardant Fabric for Safety Special Non-Slip Fabric for Extra Grip FIA 8859-1999 Certification for Peace of Mind Large Size: Up to a 36” Waist Ready to Ride? Don't just dream about the perfect race. Live it. The Sparco Circuit Carbon Fiber Racing Seat (Circuit II QRT) is waiting for you. It's not just a seat; it's your ticket to an exhilarating racing experience.

Forgeline GF3 Open Lug Forgeline's GF3 Open Lug is based upon the popular GF3 wheel, but has significant material machined from the center area for additional weight reduction, improved access to the lug nuts, and an extra-aggressive look. This street-friendly Performance Series variant utilizes a redesigned hub center and includes a unique specially-engineered tall center cap (with “Forgeline Motorsport” engraving) to cover the hub spindle and protect it from the elements. The Forgeline GF3 Open Lug is a gorgeous custom made-to-order 3-piece performance wheel with a classic 5-spoke design that was engineered for serious track duty with a 2100 lb. (per wheel) static load rating! The GF3 Open Lug features Forgeline's “I-beamed” spoke technology to reduce weight while adding strength and rigidity and hidden ARP assembly hardware for a smooth clean appearance and faster/easier wheel cleaning. Plus the design of the center allows plenty of room for caliper clearance and extreme brake fitment. The GF3 Open Lug is produced from precision-machined forged 6061-T6 aluminum centers combined with heat-treated rim shells. And just like any Forgeline wheel, the GF3 Open Lug offers fully-customizable fitment and finish, including center-lock applications. NOW AVAILABLE with a stepped lip in 18-inch, 19-inch, and 20-inch sizes. This wheel is also available in a reverse deep lip/flat lip in 18-inch and 19-inch sizes. Three-Piece Performance Wheel Classic Five-Spoke Pattern Open Lug Center Provides Improved Lug Nut Access and Weight Reduction I-Beamed Spoke Technology Engineered for Track Applications 2100 lb. Load Rating (per wheel) Stepped-Lip Design (Also available with a reverse deep lip/flat lip in 18-inch & 19-inch diameters.) Hidden ARP Fasteners Generous Brake Clearance Forged 6061-T6 Aluminum Heat-Treated Rim Shells Includes Standard Aluminum Center Cap Customizable Fitment and Finish Options Legendary Forgeline Quality and Customer Service

Forgeline GX3 Open Lug Forgeline's GX3 Open Lug is based upon their popular GX3 wheel, but has significant material machined from the center area for additional weight reduction, improved access to the lug nuts, and an extra-aggressive look. This street-friendly Performance Series variant utilizes a redesigned hub center and includes a unique specially-engineered tall center cap (with “Forgeline Motorsport” engraving) to cover the hub spindle and protect it from the elements. The Forgeline GX3 Open Lug is a gorgeous custom made-to-order 3-piece performance wheel with an attractive mesh spoke design that was engineered for serious track duty. The GX3 Open Lug features Forgeline's “I-beamed” spoke technology to reduce weight while adding strength and rigidity and hidden ARP assembly hardware for a smooth clean appearance and faster/easier wheel cleaning. Plus the design of the center allows plenty of room for caliper clearance and extreme brake fitment. The GX3 Open Lug is produced from precision-machined forged 6061-T6 aluminum centers combined with heat-treated rim shells. And just like any Forgeline wheel, the GX3 Open Lug offers fully-customizable fitment and finish, including center-lock applications. NOW AVAILABLE with a stepped lip in 18-inch, 19-inch, and 20-inch sizes. This wheel is also available in a reverse deep lip/flat lip in 18-inch and 19-inch sizes. Three-Piece Performance Wheel Attractive Mesh Spoke Pattern Open Lug Center Provides Improved Lug Nut Access and Weight Reduction I-Beamed Spoke Technology Engineered for Track Applications Stepped-Lip Design (Also available with a reverse deep lip/flat lip in 18-inch & 19-inch diameters.) Hidden ARP Fasteners Generous Brake Clearance Forged 6061-T6 Aluminum Heat-Treated Rim Shells Includes Standard Aluminum Center Cap Customizable Fitment and Finish Options Legendary Forgeline Quality and Customer Service

Forgeline WC3 Forgeline WC3 wheels are aggressively styled and built to perform with true forged 6061-T6 aluminum centers, heat-treated aluminum rim shells, and aircraft-quality stainless steel ARP fasteners. They feature a standard powder coated center finish and polished outer lip. The WC3 is offered in sizes ranging from 18"×7" to 18"×15". And since each wheel is built to order, Forgeline can offer special features like custom offsets, center locking hubs, and a choice of finish combinations. 3-Piece Performance Series Wheel Stepped-Lip Design Aircraft-Quality Stainless Steel ARP Fasteners Generous Brake Clearance Forged 6061-T6 Aluminum Heat-Treated Rim Shells Includes Standard Aluminum Center Cap Customizable Fitment and Finish Options Legendary Forgeline Quality and Customer Service

Forgeline RS3 The Forgeline RS3 Heritage Series wheel pays homage to their very first wheel design, the classic Forgeline RS of the 1990s. It has been reborn here as a modern 3-piece wheel with updated engineering and manufacturing technology. A traditional five-spoke design with tapered spokes, smooth edges, and flowing organic lines, the RS3 is muscular yet sophisticated. The RS3 is built with true forged 6061-T6 aluminum centers, aircraft-quality ARP stainless steel fasteners (your choice of exposed or hidden), and heat-treated rim sections. The RS3 is available with a stepped lip outer in 18-inch and 19-inch fitments and features a standard powder coated center finish with a polished outer rim. But since each wheel is custom built-to-order, we can also offer special features like custom offsets, center locking hubs, and a large choice of finish combinations. Three-Piece Heritage Series Wheel Traditional 5-Spoke Design is Muscular and Sophisticated Stepped-Lip Outer Your Choice of Exposed or Hidden ARP Fasteners Forged 6061-T6 Aluminum Center Heat-Treated Rim Shells Includes Standard Aluminum Center Cap Customizable Fitment and Finish Options Legendary Forgeline Quality and Customer Service

COBB Accessport V3 w/TCM Tuning for Nissan GT-R Simple ECU and TCM flashing with gauge package! The new in-cabin mountable Accessport V3 has a large, full color, higher resolution screen which allows you to monitor up to six parameters in real time. Fully customizable from the look (multiple bezel colors), layout (set up race, street, or dyno gauge clusters), and mounting options (choose from 1,000s of standard vehicle mounts). And what's looks without brains? More processing power, memory, and storage to flash faster while saving all of your maps and logs. This is your new Accessport. WHY CHOOSE COBB? The Accessport is the world's best selling, most flexible, and easiest to use ECU and TCM upgrade solution for your GT-R. Unlock power hidden within the vehicle by replacing conservative factory settings with more aggressive calibrations. Follow our staged upgrade path with pre-loaded Off The Shelf (OTS) maps or use custom mapping for any modification level. It's the last engine management solution you'll ever need. FEATURES: Large, full color, higher resolution screen Customizable multi-gauge display In vehicle mount, with on/off switch Faster and easier to use with a familiar face Interchangeable faceplates DETAILS: Simple Installation: Everything is included for the simple installation! Intuitive on-screen instructions identify your exact vehicle and available maps. Simple Uninstall: Revert your ECU to exactly as it was before with the easy to use Uninstall option from the main menu. Trouble Codes: Read engine trouble codes to diagnose issues. Clear them when resolved. Prevent expensive trips to the dealership. Change Maps: Store up to 100 maps from our OTS map database or from your favorite COBB tuner and quickly switch between them for any need. Gauges – Use your Accessport as a gauge to monitor boost or any other live information, directly from the ECU. Data Logging: Record multiple data channels simultaneously for in-depth evaluation of engine performance. Stores up to 10 hours. Performance Measuring: Welcome to your own performance evaluation suite! Measure 0-60 time, 60 foot and ¼ mile ET’s. and Trap Speed. Shift Light: Set custom RPM warning lights for perfect shifts every time. AP Manager: Use your PC or Mac to manage maps, download recorded data logs or quickly update your Accessport. Download free by clicking here. NISSAN SPECIFIC FEATURES: COBB Adjustable Traction Control: Adjust target traction slip on the fly (Slots 1-8) and maximize tire grip to best suit given track conditions (wet/damp/dry/street/slip/burnout/etc). Note: Feature must be enabled in ECU calibration for use. COBB Adjustable Launch Control: Adjust the factory launch control RPM to maximize the tire to pavement contact for that perfect launch. Note: Feature is only available on AP3-NIS-006 and AP3-NIS-008. COBB Boost Gauge wrap around: Monitor boost past 20 PSI (~150 kPa), which is an OEM limitation on the factory Multi-Function Display. The boost gauge will wrap around and display excess boost pressure. COBB Boost Off The Line: Dial in boost to optimize launches beyond the factory Launch Control logic. Boost Off The Line builds boost to spool the turbos for that perfect launch. Note: Feature must be enabled in ECU calibration for use. COBB Knock Indicator: View knock events, as they occur, on the factory Multi-Function display. COBB On The Fly Map Switching: Switch to another map on-the-fly while you drive for optimal tuning for every situation. COBB Real-time Tuning: Changes can be made to the map in real-time, while the engine is running. Greatly speeds up the tuning process and allows quick changes to powerful features like Adjustable Traction Control, Launch Control and Map Switching. COBB Rolling Boost: Load up the turbos to create boost for roll race events. Simply hold the cruise control button, “Set Coast” to build boost. Note: Feature must be enabled in ECU calibration for use. COBB Speed Density Tuning: Tune using the MAP sensor instead of the MAF sensor for big-power builds that exceed the stock MAF sensor's maximum capacity. COBB Fast ECU Flashing: Allows ECU map change flashing time to be reduced to 40 seconds or less! TCM Flashing: Re-flash the Transmission Control Module to enhance launch control, perform factory gear learning, and adjust clutch capacity and touch points. Note: Feature is only available on AP3-NIS-006 and AP3-NIS-008. TCM Adjustments: Run clutch gear learning, or adjust clutch touch points, and clutch torque capacities. Note: Feature is only available on AP3-NIS-006 and AP3-NIS-008. TCM Logging: Log transmission data monitors to diagnose mechanical issues or improve transmission characteristics. Transmission monitors can be logged simultaneously along with Engine monitors. Note: Feature is only available on AP3-NIS-006 and AP3-NIS-008. TPMS Learning: Easily re-program TPMS sensors for new wheels and tires using the Accessport and prevent cumbersome trips to the dealership! (Requires common Tire Pressure Positioning Sensor Tool.) Bank Air Learn: Re-learn and re-balance airflow between the left and right intake manifolds.

Racetech RT4100 Racing Seat Announcing the all-new Racetech 4100 Series! The RT4100 is a standard-sized fiberglass race seat. Racetech focused on achieving a lightweight seat shell with optimized geometry, straddling the line between designing the seat to be wide enough in the shoulders to suit the athletic build, but narrow enough to fit in most cockpits. Their patented back-mounted technology has trickled down from the 119 and 129 Series, giving you the option of fixing the seat to the rollcage at shoulder level. Large harness guides and a removable molded base cushion allow a range of drivers of varying heights to fit. Breathable Spacer fabric, parallel sides and pronounced thigh support round off the features of this accomplished motorsport seat. OPTIONS: The RT4100WT is 60mm taller and 40mm wider than the standard RT4100. The RT4100HR and RT4100WTHR include head restraints. The 4100 Series seats use Racetech RTB1009M alloy side mounting brackets (can be added separately). TECHNICAL INFO: Gel-coat in gloss black Seat covered is black fire-retardant nylon fabric with Spacer mesh through the torso FIA homologation 8855-1999 Shell constructed of fiberglass composite Shell weight from 5.7kg (12.5 lbs) Sizes Standard or WT (Wide & Tall) Back-mount compatible

BBS LM-R Two-Piece Wheels Not all finish options are available on all fitments, and some finish options increase wheel cost. Please call and talk to a Thunderhill custom wheel specialist at (844) 438-7244. We'll make sure you get the set of wheels you've always wanted at a price no one can beat. These Forged Line Multi-Piece wheels by BBS offer exceptional weight savings through industry-leading FEM analysis without compromising design or build quality. Every wheel in this series includes titanium fasteners and rim sections machined using a patented process specifically designed to reduce weight. Available in a wide range of sizes, finishes and bolt patterns, BBS Multi-Piece wheels has something for everyone. FEATURES Two-Piece die-forged aluminum wheel Titanium fasteners BBS patented milling inside of open spoke area Weight optimized by FEM analysis WHEEL WEIGHTS 19" diameter: 23 - 25 lbs. 20" diameter: 25 - 27 lbs. 21" diameter: 27 - 28 lbs. While many popular fitments are stocked and ready to ship, some fitments are made to order, increasing lead times. Check with a Thunderhill wheels specialist for a complete quote and estimated lead time. "PFS" centerbore designation means the wheel comes with the BBS Precision Fitment System. Prices and weights are per wheel.

Forgeline TA3 The Forgeline TA3 wheel is designed to capture the nostalgic snowflake look of iconic pony cars from another era. This wheel was first launched back in 2006, and though it was a popular design, it was available only in limited sizes. So in the spirit of the Heritage Series, Forgeline re-launched the TA3 here in a greater range of sizes. The TA3 is built with true forged 6061-T6 aluminum centers, aircraft-quality ARP stainless steel fasteners (your choice of exposed or hidden), and heat-treated rim sections. The TA3 is available with a flat lip reverse outer in 18-inch and 19-inch fitments and features a standard powder coated center finish with a polished outer rim. But since each wheel is custom built-to-order, Forgeline can also offer special features like custom offsets and a large choice of finish combinations. Three-Piece Heritage Series Wheel Snowflake Mesh Design Reminiscent of Iconic Pony Car Wheels Flat Reverse-Lip Design (Also available with a stepped-lip in 19-inch and 20-inch diameters.) Your Choice of Exposed or Hidden ARP Fasteners Forged 6061-T6 Aluminum Center Heat-Treated Rim Shells Includes Standard Aluminum Center Cap Customizable Fitment and Finish Options Legendary Forgeline Quality and Customer Service

FITS: Ferrari 355 CHALLENGE Thunderhill is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline. The GiroDisc system is an upgrade to a 2-piece steel rotor and aluminum hat combination and is a direct replacement for the OEM brake disc. The 2-piece floating disc will bolt directly to the car and work with OEM calipers perfectly. By upgrading your brakes with these lightweight high-performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The Giro Disc rotors are lighter than OEM pieces. The reduction in rotational and unsprung weight allows for quicker acceleration and suspension response. When used with Pagid or PFC performance brake pads, and Thunderhill RF-1 brake fluid (also available from CompetitionMotorsport.com), you have an amazing solution to overheating, cracking and warping rotors. The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc. The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance. The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat. The pins are secured by grade12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.

FITS: Ferrari 360 Challenge Thunderhill is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline. The GiroDisc system is an upgrade to a 2-piece steel rotor and aluminum hat combination and is a direct replacement for the OEM brake disc. The 2-piece floating disc will bolt directly to the car and work with OEM calipers perfectly. By upgrading your brakes with these lightweight high-performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The Giro Disc rotors are lighter than OEM pieces. The reduction in rotational and unsprung weight allows for quicker acceleration and suspension response. When used with Pagid or PFC performance brake pads, and Thunderhill RF-1 brake fluid (also available from CompetitionMotorsport.com), you have an amazing solution to overheating, cracking and warping rotors. The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc. The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance. The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat. The pins are secured by grade12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.