BMW M3 E9X / E92 BTCC Brake Upgrade Kit Caliper Carrier & Rotor Bell AP Racing CP9660 | XC3 Engineering
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XC3 Engineering BMW M3 E9x / E92 BTCC Brake Upgrade Kit – AP Racing CP9660
Build a serious motorsport-inspired front brake setup for your BMW E9x M3 with the XC3 Engineering BTCC Brake Upgrade Kit.
Designed for use with AP Racing CP9660 calipers and 368 × 36 mm ex-BTCC brake rotors, this kit includes the custom caliper carriers and rotor bells required to adapt proven touring-car braking hardware to the factory BMW M3 front hubs.
Precision CNC machined from 6082-T6 aluminium and designed and manufactured in the UK, the XC3 components provide the accurate fitment, strength and durability required for demanding track, clubsport and high-performance road applications.
Why Choose the XC3 BTCC Brake Upgrade Kit?
Using motorsport-derived brake rotors and AP Racing calipers provides a strong foundation for a high-performance braking system.
The XC3 kit provides the vehicle-specific hardware required to correctly mount these components to the E9x M3 chassis.
Potential benefits of the completed brake setup include:
- Improved braking consistency
- Greater heat capacity
- Improved resistance to brake fade
- Better repeatability during prolonged track use
- Increased confidence under heavy braking
- Motorsport-derived component compatibility
What's Included?
The XC3 Engineering BTCC Brake Upgrade Kit includes:
- XC3 custom caliper carriers
- XC3 custom rotor bells
- Chemi Black mounting hardware
This kit does not include the AP Racing CP9660 calipers or 368 × 36 mm BTCC rotors unless otherwise stated.
Designed for AP Racing CP9660 Calipers
The custom caliper carriers are engineered specifically around the AP Racing CP9660 caliper.
Accurate caliper positioning is essential in a performance braking system to ensure the brake pads and rotor operate in the intended position.
The XC3 carriers provide the interface between the factory BMW front hub and the upgraded AP Racing brake setup.
Designed for 368 × 36 mm Ex-BTCC Rotors
The supplied rotor bells are designed to work with compatible 368 × 36 mm ex-BTCC brake rotors.
BTCC-derived rotors are designed for demanding motorsport environments, making them particularly attractive for track-focused builds requiring strong heat management and repeatable braking performance.
Precision CNC Machined
The caliper carriers and rotor bells are precision CNC machined to achieve accurate dimensions and consistent fitment.
Precision machining is particularly important in brake conversions, where rotor and caliper alignment must remain correct under repeated high-load use.
6082-T6 Aluminium Construction
XC3 manufactures the components from 6082-T6 aluminium.
This material provides an effective combination of:
- Strength
- Rigidity
- Low weight
- Durability
It is well suited to high-performance braking and motorsport applications.
Black Anodised Finish
The components are finished in black anodising.
This provides:
- Improved corrosion resistance
- Increased surface durability
- A clean motorsport-inspired appearance
CNC Engraved Finish
XC3 branding is CNC engraved into the components for a high-quality and durable finished appearance.
High-Strength Mounting Hardware
Chemi Black hardware is included with the kit.
This provides the relevant mounting hardware required for the XC3 components and complements the durability of the braking conversion.
Motorsport & Track Applications
The XC3 BTCC Brake Upgrade Kit is particularly well suited to:
- Trackday cars
- Clubsport builds
- Motorsport-inspired E9x M3s
- Semi-slick tyre setups
- High-performance road builds
The final braking performance will depend on the complete system, including calipers, rotors, pads, fluid, lines and tyre grip.
Improved Heat Management
Track driving subjects the braking system to repeated high-energy stops.
A larger motorsport-derived rotor setup can provide increased thermal capacity compared with a conventional road-focused braking system.
This can help reduce performance degradation during repeated heavy braking.
Improved Braking Consistency
One of the main advantages of a properly configured track brake setup is maintaining more consistent performance over repeated braking events.
This is particularly important during:
- Trackdays
- Longer sessions
- High-speed braking zones
- Repeated hard use
Brake Pads & Fluid Matter
The rotor and caliper setup forms only part of a complete braking system.
For serious track use, appropriate supporting components should also be considered, including:
- Performance brake pads
- High-temperature brake fluid
- Braided brake lines
- Brake cooling
- Suitable tyres
Designed & Manufactured in the UK
XC3 Engineering designs and manufactures the kit in the UK.
The components are developed specifically to adapt the AP Racing CP9660 and BTCC rotor configuration to the BMW E9x M3 chassis.
Direct Fitment to OEM Front Hubs
The kit is designed for use with the factory BMW M3 front hubs.
No alternative front hub conversion is required.
Lifetime Warranty
XC3 Engineering backs its components with a lifetime warranty.
This provides additional confidence in the strength and durability of the caliper carrier and rotor bell components.
Warranty terms and conditions should be checked before purchase.
Professional Installation Required
Professional installation is strongly recommended.
Performance braking systems are safety-critical, so all components should be installed and inspected by a suitably experienced technician.
After installation, checks should include:
- Caliper alignment
- Rotor alignment
- Hardware torque
- Brake hose clearance
- Wheel clearance
- Pad position
- Brake fluid condition
- System bleeding
Vehicle Fitment
BMW M3 E9x
Compatible models:
- BMW E90 M3 Saloon
- BMW E92 M3 Coupe
Model years:
- 2006–2012
Designed for vehicles using:
- OEM front hubs
- AP Racing CP9660 calipers
- Compatible 368 × 36 mm ex-BTCC brake rotors
Related Components
Suitable supporting components include:
- 368 × 36 mm ex-BTCC replacement rotors
- AP Racing rotor bobbins
- AP Racing CP9660 calipers
- Performance brake pads
- Braided brake lines
- High-temperature brake fluid
A complete bolt-on E9x BTCC brake kit is also available separately.
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