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Front Motorsports Compound for the VB-Generation WRX on Stage Rally and Track
The 2022 and 2023 Subaru WRX introduced an all-new platform with a retuned suspension and a 2.4-liter turbocharged boxer engine, and its front brake system was upgraded to match. Hawk Performance part HB970C.665 applies the HPX motorsports compound to the front axle of the 2022-2023 WRX across Base, Premium, Limited, and GT trims, providing the smooth initial bite and clean release characteristics that competitive autocross and rally-stage driving demands. HPX is a motorsports compound not rated for street use.
Key Features
- HPX compound code "C" autocross and road-course optimized friction material
- Optimal temperature range: 100 to 600 degrees F; operating ceiling: 700 degrees F
- HB970C.665 validated for front axle fitment on the 2022-2023 Subaru WRX VB generation
- Covers Base, Premium, Limited, and GT trim levels for the 2022-2023 WRX front caliper
- Smooth initial bite suited to the symmetrical AWD torque distribution and ABS calibration of the WRX
- Not compatible with carbon ceramic rotors; iron and steel rotor use only
- Motorsports configuration shims not included in the HB970C.665 set
- Hawk Performance limited lifetime warranty
What's Included
- One set of Hawk HPX front brake pads (HB970C.665) for the 2022-2023 Subaru WRX
Installation Instructions
- Safely raise the vehicle and support on jackstands; remove both front wheels.
- Remove the caliper slide pin bolts and pivot the caliper off the rotor without stressing the brake hose.
- Remove the old front pads and clean the caliper bracket abutment clips and contact surfaces.
- Compress the caliper pistons using a piston press tool until fully retracted.
- Seat the new HB970C.665 HPX pads in the carrier, confirm secure retention, and reinstall the caliper.
- Torque the slide pin bolts to Subaru WRX factory specification for the 2022-2023 model year.
- Reinstall wheels, torque lug nuts, and pump the pedal to restore firm pedal feel before driving.
- Complete the Hawk bed-in sequence on track before hard braking: multiple progressive deceleration events from 60 mph with full cool-down periods between each run.
Specs
| Attribute | Detail |
|---|---|
| Part Number (MPN) | HB970C.665 |
| SKU | HAWKHB970C.665 |
| UPC | 840653128855 |
| Compound | HPX (Code C) |
| Position | Front |
| Pad Thickness | 0.665 in |
| Optimal Temp Range | 100 to 600 degrees F |
| Max Operating Temp | 700 degrees F |
| Torque Level | Low to Medium |
| Street Legal | No motorsports use only |
| Shims Included | No |
| Rotor Compatibility | Iron / steel rotors only |
| Warranty | Limited lifetime (Hawk Performance) |
This Part Fits
| Year | Make | Model | Submodel / Notes |
|---|---|---|---|
| 2022 | Subaru | WRX | Base / Premium / Limited / GT Front |
| 2023 | Subaru | WRX | Base / Premium / Limited / GT Front |
Frequently Asked Questions
Does HB970C.665 fit the WRX STI?
No. The WRX STI uses a larger Brembo caliper system with a different pad shape. HB970C.665 is specific to the standard WRX front caliper configuration for 2022-2023.
Will HB970C.665 fit the 2024 or 2025 WRX?
The HB970C.665 fitment data covers 2022 and 2023 WRX models. Verify compatibility for 2024 and later model years with a Hawk Performance dealer, as production changes may affect caliper fitment.
Is the HPX compound appropriate for Subaru Rally experience or SCCA autocross?
Yes. HPX was specifically engineered for autocross and road-course applications. Its smooth initial bite and clean modulation are well-suited to the driving demands of both SCCA autocross and stage rally preparation.
Does the 2022-2023 WRX require special tools to retract the front calipers during installation?
The front calipers on the 2022-2023 WRX use conventional push pistons that retract with a standard C-clamp or piston press tool. No specialized wind-back tool is required for the front axle.
What is the pad thickness encoded in HB970C.665?
The numeric suffix .665 represents 0.665 inches of friction material thickness using Hawk Performance's standardized part numbering format.
Should HB970C.665 front pads be paired with a specific rear compound for balanced braking?
Yes. For balanced brake torque distribution on the 2022-2023 WRX, Hawk recommends sourcing a matched HPX rear compound for the WRX platform. Consult a Hawk dealer for the appropriate rear part number.
Are electronic wear sensors or shims included with HB970C.665?
No. HPX motorsports pad sets do not include shims or electronic wear sensors. Inspect pad thickness visually before each track session.
How does the HPX compound perform on the WRX's standard Brembo-branded front calipers versus non-Brembo OEM calipers?
HB970C.665 is calibrated for the standard WRX front caliper regardless of manufacturer branding. Performance differences are minimal; the compound's friction characteristics remain consistent across caliper types within its operating temperature window.
Proposition 65 Warning: This product can expose you to chemicals including chromium, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
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