Racing Brake Rotors

GiroDisc Replacement Rotor Rings for Brembo / StopTech 332x32mm Big Brake Kits Replacement Rotor Rings for GiroDisc Two-Piece Brake Rotors Keep your GiroDisc-equipped Brembo or StopTech big brake kit performing at its best with genuine GiroDisc 332x32mm replacement rotor rings. Designed as direct replacements for worn GiroDisc rotor discs, these rings reuse your existing GiroDisc aluminum hats and floating hardware for a cost-effective brake refresh. Fits: Brembo and StopTech 332x32mm Big Brake Kits equipped with compatible GiroDisc two-piece rotors. Important: These are replacement rotor discs only. Aluminum hats are not included. GiroDisc Replacement Rotor Features 332x32mm replacement rotor rings Designed for compatible Brembo and StopTech big brake kits Direct replacement for existing GiroDisc two-piece rotor assemblies Reuses your existing GiroDisc aluminum hats Fully floating two-piece rotor design High-strength alloy steel drive pin system Designed to accommodate radial and axial thermal expansion Anti-noise spring washers help minimize floating rotor rattle Rotor-only replacement reduces long-term brake system operating costs Excellent heat management and cooling for demanding street and track use GiroDisc Floating Rotor Design GiroDisc's two-piece rotor system uses a fully floating connection between the cast-iron rotor ring and aluminum hat. High-strength alloy steel drive pins transfer braking loads while allowing the rotor to expand independently as temperatures increase under hard braking. The drive pins are manufactured by GiroDisc in the USA to its own specifications and are cadmium plated for corrosion resistance. Grade 12 cap screws, hardened washers, and anti-noise spring washers secure the assembly while allowing the necessary axial and radial float. The result is a durable, high-performance rotor system that manages heat effectively without the excessive noise commonly associated with traditional floating rotors. Replace the Wear Item, Not the Entire Rotor One of the primary advantages of the GiroDisc two-piece system is serviceability. Once the rotor rings reach their wear limit, the existing aluminum hats can be reused rather than replacing the complete rotor assembly. This significantly reduces replacement cost while maintaining the braking performance, cooling, and durability expected from GiroDisc. Authorized GiroDisc Dealer Competition Motorsport is an authorized GiroDisc dealer and one of the largest stocking GiroDisc dealers in the country. We stock a wide range of GiroDisc brake components for fast shipment and knowledgeable support. Sold and priced as a pair.

The problem of brake fluid boiling is simply traced to heat transferring from the rotors and pads directly into the fluid through the caliper pistons.  When brake fluid boils, it releases air that is normally part of the molecular structure of the fluid.  This air is compressible, of course, and the brake pedal goes to the floor instead of moving the caliper pistons.  Production cars tend to suffer from this on track days because they don't have the extensive cooling ducts and exotic brake materials found on racing cars.   Race-only brake calipers generally come with titanium caliper pistons for one reason: titanium has low thermal conductivity. This means it's very bad at transferring heat, which is good if you're trying to keep your brake fluid from boiling.  Here's a comparison of materials and their relative thermal conductivity ratings (lower is better): Titanium 6AL-4V = 6.7 W/mk Steel = 52 W/mk Aluminum = 130 W/mk Most fixed calipers use aluminum pistons which are, unfortunately, excellent at transferring braking heat to your brake fluid. Our solution is to place Girodisc's thin titanium shims between the brake pad and the caliper pistons. This helps prevent braking heat from transferring into the pistons and, thus, into the fluid.  For cars that are going to see hard or multiple track days, these shims are affordable protection from losing your brake pedal at the wrong time and making your track day very expensive. Water jet cut to exact size; no cutting, grinding, or swearing involved. Price is per axle (four shims)

Girodisc Titanium Brake Pad Shields Fitment: Porsche 991, 992, GT4 (Front) The problem of brake fluid boiling is caused by braking heat transferring from the rotors and pads directly into the fluid through the caliper pistons. When brake fluid boils, it releases air that is normally part of the molecular structure of the fluid. This air is compressible, of course, so brake pedal pressure compresses this air instead of pushing brake fluid and moving the caliper pistons. The brake pedal goes to the floor. Production street cars tend to suffer from this on track days because they don't have the extensive cooling ducts and exotic brake materials found on race cars. Race-only brake calipers generally come with titanium caliper pistons for one reason: titanium has very low thermal conductivity, which means it's bad at transferring heat. That's good if you're trying to keep your brake fluid from boiling. Here's a comparison of materials and their relative thermal conductivity ratings in Watts per meter-Kelvin (lower is better): Titanium 6AL-4V = 6.7 W/mK Steel = 52 W/mK Aluminum = 130 W/mK Most fixed calipers use aluminum pistons which are, unfortunately, excellent at transferring braking heat to your brake fluid. Our solution is to place Girodisc's thin titanium shims between each brake pad and the caliper pistons. This helps prevent braking heat from transferring into the pistons and, thus, into the fluid. For cars that are going to see hard driving or multiple track days, these shims are affordable protection against losing your brake pedal at the worst possible time, making your track day very expensive. Water-jet cut to exact size, so there's no cutting, grinding, or swearing involved. Price is per axle (four shims)

Girodisc Titanium Brake Pad Shields Fitment: Porsche 991, 992, GT4 Rear The problem of brake fluid boiling is due to heat transferring from the rotors and pads directly into the fluid through the caliper pistons. When brake fluid boils, it releases air that is normally part of the molecular structure of the fluid. This air is compressible, of course, and the brake pedal goes to the floor instead of moving the caliper pistons. Production cars tend to suffer from this on track days because they don't have the extensive cooling ducts and exotic brake materials found on race cars. Race-only brake calipers generally come with titanium caliper pistons for one reason: titanium has low thermal conductivity. This means it's very bad at transferring heat, which is good if you're trying to keep your brake fluid from boiling. Here's a comparison of materials and their relative thermal conductivity ratings (lower is better): Titanium 6AL-4V = 6.7 W/mk Steel = 52 W/mk Aluminum = 130 W/mk Most fixed calipers use aluminum pistons which are, unfortunately, excellent at transferring braking heat to your brake fluid. Our solution is to place Girodisc's thin titanium shims between the brake pad and the caliper pistons. This helps prevent braking heat from transferring into the pistons and, thus, into the fluid. For cars that are going to see hard or multiple track days, these shims are affordable protection from losing your brake pedal at the wrong time and making your track day very expensive. Water jet cut to exact size; no cutting, grinding, or swearing involved. Price is per axle (four shims)

Lotus Emira Rear Caliper Rebuild Kit Been to a few too many track days? If your rear calipers are feeling sticky or weak, this kit replaces the hard-worked piston seals and dust boots to get them operating like new. Fitment Lotus Emira rear caliper. If you are unsure about compatibility, compare your caliper’s piston count and dimensions to your factory service information. Refresh your rear braking performance with a precise, track-tested kit Each kit services one front caliper and includes new piston seals and high-temperature dust boots built to our spec. Pair rebuilt calipers with titanium pad shields to reduce heat transfer and extend service intervals. CCRK2-388 Features One kit services one front caliper Includes piston seals and dust boots made to our specifications Designed to withstand high brake temperatures common on track Restores caliper feel, consistency, and pad release Recommended with titanium pad shields for added heat protection What’s included Piston seals and dust boots sufficient to rebuild one Lotus Emira rear brake caliper. Fitment Lotus Emira front caliper. If you are unsure about compatibility, compare your caliper’s piston count and dimensions to your factory service information. Installation notes Clean all components thoroughly; avoid scratching piston surfaces Use appropriate brake assembly lube and fresh DOT-rated brake fluid specified by the vehicle manufacturer After assembly, bleed the system and verify a firm, consistent pedal Follow torque specs and procedures in the factory service manual Lotus Emira Front Caliper Rebuild Kit CCRK2-388 FAQs Does one kit cover both front calipers? No. One kit services one caliper. Order two kits to service both rear calipers. How do I know my caliper seals need replacement? Common signs include uneven pad wear, dragging brakes, fluid seepage, a soft pedal, or pistons that don’t retract smoothly after braking. Can I install this at home? Experienced DIYers can rebuild calipers with the right tools and a service manual. If you are unsure, consult a professional technician. Do I need new brake fluid after the rebuild? Yes. Always use fresh fluid that meets the manufacturer’s specification and fully bleed the system after service. Will titanium pad shields really help? They reduce heat transfer from pads to pistons, helping protect seals and fluid, especially during repeated high-temperature track use. Ready to restore consistent braking performance? Add the Lotus Emira Rear Caliper Rebuild Kit to your cart, and consider titanium pad shields to keep your system cooler on track.

Lotus Emira Rear Caliper Rebuild Kit Been to a few too many track days? If your rear calipers are feeling sticky or weak, this kit replaces the hard-worked piston seals and dust boots to get them operating like new. Fitment Lotus Emira rear caliper. If you are unsure about compatibility, compare your caliper’s piston count and dimensions to your factory service information. Refresh your rear braking performance with a precise, track-tested kit Each kit services one rear caliper and includes new piston seals and high-temperature dust boots built to our spec. Pair rebuilt calipers with titanium pad shields to reduce heat transfer and extend service intervals. CCRK2-388 Features One kit services one rear caliper Includes piston seals and dust boots made to our specifications Designed to withstand high brake temperatures common on track Restores caliper feel, consistency, and pad release Recommended with titanium pad shields for added heat protection What’s included Piston seals and dust boots sufficient to rebuild one Lotus Emira rear brake caliper. Fitment Lotus Emira rear caliper. If you are unsure about compatibility, compare your caliper’s piston count and dimensions to your factory service information. Installation notes Clean all components thoroughly; avoid scratching piston surfaces Use appropriate brake assembly lube and fresh DOT-rated brake fluid specified by the vehicle manufacturer After assembly, bleed the system and verify a firm, consistent pedal Follow torque specs and procedures in the factory service manual Lotus Emira Rear Caliper Rebuild Kit CCRK2-388 FAQs Does one kit cover both rear calipers? No. One kit services one caliper. Order two kits to service both rear calipers. How do I know my caliper seals need replacement? Common signs include uneven pad wear, dragging brakes, fluid seepage, a soft pedal, or pistons that don’t retract smoothly after braking. Can I install this at home? Experienced DIYers can rebuild calipers with the right tools and a service manual. If you are unsure, consult a professional technician. Do I need new brake fluid after the rebuild? Yes. Always use fresh fluid that meets the manufacturer’s specification and fully bleed the system after service. Will titanium pad shields really help? They reduce heat transfer from pads to pistons, helping protect seals and fluid, especially during repeated high-temperature track use. Ready to restore consistent braking performance? Add the Lotus Emira Rear Caliper Rebuild Kit to your cart, and consider titanium pad shields to keep your system cooler on track.

Performance Friction PFC 380.070.63-64 380mm Two-Piece Front Floating Racing Brake Rotors Fit The Following Cars (w/ OEM Iron Rotors) Porsche 991 GT3 (Front) Porsche 991 GT3RS (Front) Porsche 981 GT4 (Front) PFC the manufacturer of Porsche Cup braking systems developed a 380x34mm front rotor replacement kit that is a direct replacement for the OEM Iron Brake rotors.  Performance Friction PFC V3 Discs with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. Sold/priced per pair.

Performance Friction PFC 380.075.63-64 380mm Two-Piece Rear Floating Racing Brake Rotors Fit The Following Cars (w/ OEM Iron Rotors) Porsche 992 GT3 (Rear) Porsche 992 GT3RS (Rear) Porsche 718/982 GT4RS (Rear) Porsche 991 GT2RS/GT3/GT3RS (Rear) Porsche 981 GT4 (Rear) PFC the manufacturer of Porsche Cup braking systems developed a 380x30 mm rear rotor replacement kit that is a direct replacement for the OEM Steel Brake rotors.  Performance Friction PFC V3 Disks with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. PFC’s V3 discs are optimized to ensure the highest level of performance, wear and durability for your Porsche’s braking system.  These high-performance OEM replacement assemblies now feature aluminium hats in both front and rear, similar to the original. There is a saving of over one pound by trimming excess material from the unused areas around the disc in our new V3 ZeroFailures™ design, which will allow for disc changes in a matter of seconds with a flat head screwdriver. Sold/priced per pair.

Performance Friction PFC 380.30.0065.451/461 380mm Rear Floating Racing Brake Rotors Replacement Rotors only (no hats) for 380.075.63/64 which fit the Following Cars (w/ OEM Iron Rotors) Porsche 992 GT3 (Rear) Porsche 992 GT3RS (Rear) Porsche 718/982 GT4RS (Rear) Porsche 991 GT2RS/GT3/GT3RS (Rear) Porsche 981 GT4 (Rear) PFC the manufacturer of Porsche Cup braking systems developed a 380x30 mm rear rotor replacement kit that is a direct replacement for the OEM Steel Brake rotors.  Performance Friction PFC V3 Disks with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. PFC’s V3 discs are optimized to ensure the highest level of performance, wear and durability for your Porsche’s braking system.  These high-performance OEM replacement assemblies now feature aluminium hats in both front and rear, similar to the original. There is a saving of over one pound by trimming excess material from the unused areas around the disc in our new V3 ZeroFailures™ design, which will allow for disc changes in a matter of seconds with a flat head screwdriver. Sold/priced per pair.

Performance Friction PFC 380.34.0062.451/461 380mm Front Floating Racing Brake Rotor Replacements Fit The Following Cars (w/ OEM Iron Rotors) - Center hat Excluded, rotor disc only. Replacement Disc Only For PFC 380.070.63/64 Porsche 991 GT3 (Front) Porsche 991 GT3RS (Front) Porsche 981 GT4 (Front) PFC the manufacturer of Porsche Cup braking systems developed a 380x34mm front rotor replacement kit that is a direct replacement for the OEM Iron Brake rotors.  Performance Friction PFC V3 Discs with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. Sold/priced per pair.

Performance Friction PFC 390.075.63-64 390mm Two-Piece Rear Floating Racing Brake Rotors Fit The Following Cars (w/ OEM PCCB Rotors) Porsche 992 GT3 (Rear) Porsche 992 GT3RS (Rear) Porsche 718/982 GT4RS (Rear) Porsche 991 GT2RS/GT3/GT3RS (Rear) Porsche 981 GT4 (Rear) PFC the manufacturer of Porsche Cup braking systems developed a 390x32 mm rear rotor replacement kit that is a direct replacement for the OEM Steel Brake rotors.  Performance Friction PFC V3 Disks with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. PFC’s V3 discs are optimized to ensure the highest level of performance, wear and durability for your Porsche’s braking system.  These high-performance OEM replacement assemblies now feature aluminium hats in both front and rear, similar to the original. There is a saving of over one pound by trimming excess material from the unused areas around the disc in our new V3 ZeroFailures™ design, which will allow for disc changes in a matter of seconds with a flat head screwdriver. Sold/priced per pair.

Performance Friction PFC 390.32.0066.451/461 390mm Replacement Rear Floating Racing Brake Rotors Fit The Following Cars (w/ OEM PCCB Rotors)- Center hat Excluded, rotor disc only. Replacement Disc Only For PFC 390.075.63/64 Porsche 992 GT3 (Rear) Porsche 992 GT3RS (Rear) Porsche 718/982 GT4RS (Rear) Porsche 991 GT2RS/GT3/GT3RS (Rear) Porsche 981 GT4 (Rear) PFC the manufacturer of Porsche Cup braking systems developed a 390x32 mm rear rotor replacement kit that is a direct replacement for the OEM Steel Brake rotors.  Performance Friction PFC V3 Discs with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. PFC’s V3 discs are optimized to ensure the highest level of performance, wear and durability for your Porsche’s braking system.  These high-performance OEM replacement assemblies now feature aluminium hats in both front and rear, similar to the original. There is a saving of over one pound by trimming excess material from the unused areas around the disc in our new V3 ZeroFailures™ design, which will allow for disc changes in a matter of seconds with a flat head screwdriver. Sold/priced per pair.

Performance Friction PFC 410.069.63-64 410mm Two-Piece Front Floating Racing Brake Rotors Fit The Following Cars (w/ OEM Iron Rotors or PCCB Rotors) Porsche 991 GT2RS PCCB (Front) Porsche 991 GT3 PCCB (Front) Porsche 991 GT3RS PCCB (Front) Porsche 718 / 982 GT4RS PCCB or Iron (Front) Porsche 718 GT4 PCCB (Front) PFC the manufacturer of Porsche Cup braking systems developed a 410mm front rotor replacement kit that is a direct replacement for the OEM 991 GT or 718 GT4 PCCB Brake rotors or OEM 718 / 982 GT4RS with PCCB or Iron rotors.  Performance Friction PFC V3 Disks with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. Sold/priced per pair.

Performance Friction PFC 410.057.63-64 410mm Two-Piece Front Floating Racing Brake Rotors Fit The Following Cars (w/ OEM Iron Rotors or PCCB Rotors) Porsche 992 GT3 (Front) Porsche 992 GT3RS (Front) PFC the manufacturer of Porsche Cup braking systems developed a 410x34mm front rotor replacement kit that is a direct replacement for the OEM Steel/PCCB Brake rotors.  Performance Friction PFC V3 Disks with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. Sold/priced per pair.

Performance Friction PFC 410.34.0063.451/461 410mm Replacement Front Floating Racing Brake Rotors Fit The Following Cars which use PFC 410.069.63/64 (w/ OEM Iron Rotors or PCCB Rotors) - Center hat Excluded, rotor disc only. Replacement Disc Only For PFC 410.069.63/64 and 410.057.63/64 Porsche 992 GT3 PCCB/Iron (Front) Porsche 992 GT3RS PCCB/Iron (Front) Porsche 991 GT2RS PCCB (Front) Porsche 991 GT3 PCCB (Front) Porsche 991 GT3RS PCCB (Front) Porsche 718 / 982 GT4RS PCCB or Iron (Front) Porsche 718 GT4 PCCB (Front) PFC the manufacturer of Porsche Cup braking systems developed a 410mm front rotor replacement kit that is a direct replacement for the OEM 991 GT or 718 GT4 PCCB Brake rotors or OEM 718 / 982 GT4RS with PCCB or Iron rotors.  Performance Friction PFC V3 Discs with Zero Failure Technology Unique Rotor and Hat interface, eliminating most hardware. The elimination of hardware reduces weight, complexity, and installation time for less down time and more seat time on the track.  Replace your rotor discs in minutes with a flat head screwdriver PFC metallurgy specified for high Thermal stability and mechanical strength for increased longevity 48 vane geometry engineered for increased airflow for increased brake cooling during the heat of the battle while on track Patented slot pattern for increased initial bit and pad surface conditioning Lightweight forged hard anodized aluminum hat for increased durability and performance The two-piece PFC V3 design allows for disc-only replacement as well, minimizing future replacement costs and delivering outstanding performance. Sold/priced per pair.

PFC Front Slotted Replacement Disc V2/V3 Porsche 991 GT3 Cup / 981 GT4 Clubsport Restore your braking performance with the PFC Front Slotted Replacement Disc, engineered specifically for the Porsche 991 GT3 Cup and Porsche Cayman GT4 Clubsport with PFC front rotors. This is a set of two replacement discs (rotor rings) only, and does not include the aluminum rotor hats. Designed for uncompromising track performance, this 380mm V2/V3 slotted disc restores the exceptional stopping power, durability, and heat management of your PFC front brake rotors. Precision-Machined for Motorsport Applications Crafted from high-quality materials and manufactured to exacting motorsport standards, this replacement disc ensures consistent performance under extreme braking conditions. The V2/V3 slotted design enhances pad bite, improves heat dissipation, and reduces the risk of glazing—making it ideal for sprint racing and high-intensity track use. Key Features: Optimized Dimensions: 380mm diameter x 32mm thickness for perfect fit and performance. V2/V3 Slotted Design: Maximizes braking efficiency, heat management, and debris removal. Direct Replacement: Fits Porsche 991 GT3 Cup (Sprint) and Porsche 981 Cayman GT4 Clubsport (FIA GT4 homologated) models with PFC front slotted two-piece floating rotors. Track-Focused Performance: Engineered for demanding racing environments. Disc Only: Brake bell not included. Compatibility: Porsche 991 GT3 Cup (Sprint). Not for use in official Porsche Carrera Cup championships. Porsche Cayman GT4 Clubsport (FIA GT4 homologated) GT4CS. Part Numbers: 380.32.0054.451 380.32.0054.461 Whether you're chasing podiums or refining your lap times, the PFC Front Slotted Replacement Disc returns the braking performance, reliability, and precision the PFC brake rotors on your Porsche 991 GT3 Cup or GT4 Clubsport demands. Order today from Competition Motorsport for expert service and fast shipping.