Description
The EXEDY Performance Clutch Kit – 2004–2014 Impreza / 2006–2009 Legacy / 2015–2019 WRX STI (Subaru) is tailored to 2004–2014 Impreza / 2006–2009 Legacy / 2015–2019 WRX STI (Subaru) and is best considered when the goal is reliable torque transfer, predictable engagement, and hardware appropriate for enthusiast street, autocross, HPDE, and modified performance builds.
EXEDY Heritage
EXEDY's history reaches back to 1923 in Japan, with decades of clutch development under the Daikin Clutch name. The company is both a major OEM powertrain supplier and a long-established performance-clutch manufacturer, with products engineered for everything from original-power street cars to dedicated motorsports use.
How This Product Is Intended to Be Used
EXEDY's performance single- and multi-plate systems are intended to raise torque capacity and heat tolerance while matching the engagement characteristics to the car's intended use. Stage 1 uses an organic friction strategy for the most street-friendly behavior; Stage 2 moves to cerametallic friction for harder use; Hyper systems add dedicated flywheel and multi-plate architecture for substantially higher-output builds.
Choose the least aggressive configuration that comfortably covers the engine's torque and heat load. That approach normally gives the best balance of drivability, service life, transmission friendliness, and track durability.
Available Configurations
This parent listing contains multiple EXEDY configurations for the same application family. The differences below are functional and should be selected around torque demand, heat load, and acceptable engagement behavior.
| Configuration | EXEDY Part Number | Construction / Character | Torque Capacity | Recommended Use |
|---|---|---|---|---|
| Stage 2 Cerametallic (15951HDP4) | 15951HDP4 | Cerametallic performance disc. More positive/aggressive engagement. | Application-specific; higher than Stage 1 in many applications | Track-biased street cars and higher-heat or higher-torque builds |
| Stage 2 Cerametallic (15951P4) | 15951P4 | Cerametallic performance disc. More positive/aggressive engagement. | Application-specific; higher than Stage 1 in many applications | Track-biased street cars and higher-heat or higher-torque builds |
| Stage 2 Cerametallic – Thick Disc (15951) | 15951 | Thick cerametallic disc. Aggressive, with added thermal mass. | Application-specific | Hard street/track use where repeated heat cycles and torque capacity take priority |
| Stage 2 Cerametallic – Thick Disc (15951HD) | 15951HD | Thick cerametallic disc. Aggressive, with added thermal mass. | Application-specific | Hard street/track use where repeated heat cycles and torque capacity take priority |
Selection Notes
The variants offered for 2004–2014 Impreza / 2006–2009 Legacy / 2015–2019 WRX STI (Subaru) are not cosmetic choices: each changes friction behavior, thermal capability, clamp-load strategy, or plate count. Match the selection to actual engine torque, tire grip, vehicle weight, launch frequency, and street-versus-track duty rather than simply choosing the most aggressive option.
Technical Notes
- Clamp Load: Stage 1/2 covers are designed around roughly 40% higher clamping load than the genuine part
- Pedal Effort: Typical Stage 1/2 increase is approximately 20–35%, application dependent
- Flywheel Compatibility: Stage 1/2 generally use the OEM flywheel unless noted; Hyper systems include/require their dedicated flywheel
- Certification: EXEDY Stage 1, Stage 2 and Lightweight Flywheel products are SFI 1.1 certified
- Vehicle Application: 2004–2014 Impreza / 2006–2009 Legacy / 2015–2019 WRX STI (Subaru)
- EXEDY SKUs: 15951HDP4, 15951P4, 15951, 15951HD
Application-specific construction notes: Cerametallic friction.
Fitment note: Because clutch fitment is sensitive to transmission and flywheel changes, verify the complete vehicle configuration before purchase. Modified swaps or previously converted flywheel systems may require a different EXEDY part than a stock vehicle.