Comp1 Clutch 4-15031-C Twin Disc Ceramic Kit w/Flywheel for Subaru STI EJ257

Vehicle Fitment

• 2004-2007 Subaru Impreza WRX STI 2.5L Turbo EJ257 6-speed
• 2008-2014 Subaru Impreza WRX STI 2.5L Turbo EJ257 6-speed
• 2015-2021 Subaru WRX STI 2.5L Turbo EJ257 6-speed

Fitment Notes

• STI 6-speed transmission only -- does NOT fit 5-speed WRX
• Push type clutch -- includes pull-to-push conversion components
• Plug and play -- no transmission modifications required
• Does NOT fit 2022+ WRX (FA24 engine, different platform)

Features

• Comp1 (Competition Clutch) Twin Disc ceramic racing clutch kit
• Rated 500-1,200 HP depending on application
• 650 ft-lbs torque capacity at the wheel
• 4140 forged steel flywheel for extreme durability
• 6061 T6 aluminum cover -- lightweight and strong
• 6150 steel diaphragm
• Ceramic disc material for aggressive engagement
• Complete kit -- no additional parts needed

Specifications

• Part Number: 4-15031-C
• Type: Twin disc ceramic clutch kit with flywheel
• Disc Material: Ceramic
• Disc Outer Diameter: 184mm
• Disc Center Style: Rigid (solid hub)
• Pressure Plate Style: Push type
• Flywheel: 4140 forged steel
• Cover: 6061 T6 aluminum
• Diaphragm: 6150 steel
• Torque Capacity: 650 ft-lbs at the wheel
• HP Rating: 500-1,200 HP
• Country of Origin: USA

Included Components

• Twin ceramic clutch discs
• 4140 forged steel flywheel
• 6061 T6 aluminum cover with 6150 steel diaphragm
• Pilot bearing
• Throwout bearing
• Clutch fork and hardware
• Alignment tool

Product Description

The Comp1 4-15031-C is a twin disc ceramic clutch kit with forged flywheel for the 2004-2021 Subaru WRX STI equipped with the 2.5L EJ257 turbo engine and 6-speed transmission. Rated to hold 500-1,200 HP with 650 ft-lbs of torque capacity at the wheel, this kit is designed as an economical multi-plate racing clutch for heavily modified STIs. The ceramic twin discs provide aggressive engagement, while the 4140 forged steel flywheel ensures durability under extreme racing conditions.

The 6061 T6 aluminum cover and 6150 steel diaphragm keep the assembly lightweight and strong. Push type design includes all necessary conversion components for pull-type STI transmissions -- plug and play with no transmission modifications required. Complete kit includes pilot bearing, throwout bearing, clutch fork, hardware, and alignment tool. Made in the USA. Does not fit the 2022+ WRX (FA24 platform).