BMW M3 E9X / E92 BTCC Big Brake Kit – AP Racing CP9660 Nickel Finish Complete Kit | XC3 Engineering
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Upgrade your BMW M3 E9X / E92 with a premium, track-ready brake system: the XC3 BTCC Big Brake Kit featuring nickel-plated AP Racing CP9660 calipers, CNC-machined alloy bells and carriers, 368 mm rotors, braided lines and all required hardware. Built for performance driving, club racing, track days or performance street use — delivering robust stopping power, durability, and consistent braking under high load.
Kit Contains:
- XC3 Engineering custom anodised rotor bells
- XC3 Engineering custom anodised caliper brackets
- Chemi black bracket hardware
- 2x AP Racing 6 piston Pro 5000 series R calipers CP9660 - Nickel Plated
- Braided brake lines
- 2x AP Racing Bobbins kit
- 2x ex-BTCC 368mm x 36mm rotors
- Ex-BTCC brake pads Raybestos ST45 (Project MU H21 also available please contact us)
The BTCC rotors are previously used components. AP Racing do not offer this rotor size for public sale, as it is exclusively provided to BTCC teams. The rotors we supply have been used during a single session at a BTCC event and have undergone inspection to confirm they are in proper working order.
Pads are also used items, this again keep our kit as cost effective as possible when replacing considerable parts.
Raybestos ST45 & Project Mu H21 comparison
| Attribute | Raybestos ST45 | Project Mu H21 |
|---|---|---|
| Pad Compound / Material | Mid-to-high performance racing compound, established racing pad material. | High-end carbon-ceramic racing compound, competition-only spec. |
| Intended Use | Endurance, heavy braking road-course racing, clubsport, track days — good balance of performance and rotor/ pad wear. | Motorsport / racing: GT, road course, short-oval, high-demand braking environments; “competition-only” pad. |
| Operating Temperature Range (Rotor) | – 700 °C | 200 °C – 850 °C |
| Friction / Bite & Brake Feel | Consistent, predictable mid-to-high friction — good modulation and stable performance under repeated heavy braking. | Very aggressive, track-optimised friction; strong bite and fade resistance, stable through high heat cycles. |
| Rotor / Pad Wear & Rotor Friendliness | Lower wear rate compared to aggressive race pads; relatively rotor-friendly - a good compromise for clubsport/use with repeated calls. | According to manufacturer - “very kind to the rotor,” even under high stress braking, despite high performance. |
| Use-Case Strengths | - Clubsport/track-day cars that also see occasional road use - Situations needing consistent, repeatable braking under repeated heavy use - Good balance between performance & maintenance (rotor/pad wear) | - Full-on track cars, racing builds (GT, Time Attack, sprint, oval) - High-heat endurance or repeated hard braking - Builds where maximum braking performance is required and pad/rotor wear is accepted as part of use |
| Trade-offs / Considerations | Slightly less aggressive bite than “pure race” pads — may be less dramatic initial feel in very aggressive braking; but good balance overall. | As “competition-only” pad — may be noisy, dusty; cold-bite may be less predictable; less ideal for regular street use; pad/rotor wear may be more demanding. |
Fitment:
2006-2012 BMW M3 E90 E91 E92 with OEM front Hubs
We understand it can be a bit confusing to figure out if a part will work for your car. No worries! Just shoot us a message with your question, and our friendly sales team will then be in touch to confirm if this part is the correct for your vehicle!
Disclaimer:
Products sold by Nineteen72 Performance are exclusively designed for off-road or sanctioned competition use. Any use on public roads is strictly prohibited and may violate local, state, and federal laws. Nineteen72 Performance does not confirm the legality of road use; it is the consumer's responsibility to comply with applicable laws. Use of these products for any purpose other than intended is at the user's own risk. Nineteen72 Performance is not liable for misuse or non-compliance.
Warranty:
At Nineteen72 Performance, we proudly back every product in our store, ensuring that each item comes with a comprehensive warranty.
All components crafted by our esteemed third-party partners in the store are accompanied by a minimum one-year manufacturer's warranty. Our warranty terms are uniform across all products, providing coverage for any manufacturing defects that may arise over time, excluding typical wear and tear. Your satisfaction and product durability are our top priorities.
Shipping & Returns:
At Nineteen72 Performance we offer worldwide shipping.
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Love what you bought from Nineteen72 Performance? Great! If not, no worries. Enjoy a hassle-free 14-day return window. Just ensure your items are unused and in their original condition. For returns, contact us at Returns@Nineteen72Performance.co.uk. Your satisfaction drives us.
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