Competition Clutch 04-20 Subaru STi Stock Clutch Kit
Most STI owners shopping for a clutch are not chasing more power. The factory clutch has simply worn out: the engagement point has crept to the top of the pedal, fourth and fifth slip when boost comes in, or the car shudders pulling away on a hill. Competition Clutch 15030-STOCK is an OE-style replacement kit for the 2.5L turbo WRX STI, built to put the car back to factory feel instead of turning it into a race car.
The STI sends turbo EJ257 torque through a single-disc dry clutch into its six-speed gearbox. The pressure plate clamps the disc against the flywheel, and the release bearing lets the driver break that clamp with the pedal. Competition Clutch describes this kit as matching the original torque capacity rating with a smooth, factory pedal feel. It uses an OE-style pressure plate and an organic full-face disc, which is the gentle, quiet engagement most daily drivers want. For a stock car or one with basic bolt-ons, that is the right choice. If the engine has a larger turbo or an aggressive tune, the stock-rated kit will not hold it; look at the 15030-2600 Stage 3 or 15030-1620 Stage 4 instead.
Do a third or fourth gear roll-on from low rpm at full throttle. If the tach jumps ahead of road speed, the disc is slipping. Before pulling the transmission, make sure the problem is not elsewhere: check the clutch fluid level and condition, bleed the hydraulics if the pedal is soft, and look under the bellhousing for oil from a rear main seal or a leaking slave cylinder. Our slipping diagnosis guide walks through separating real slip from other causes, and flare vs slip explains what each feels like from the driver's seat.
Our listing is titled for 2004-2020 STI. Competition Clutch lists 15030-STOCK for the 2004-2014 Impreza WRX STI and the 2015-2021 WRX STI, all with the 2.5L turbo. It is not listed for the non-STI WRX, which uses a different clutch and gearbox, or for the 2.0L cars. Some STIs have had transmission swaps or aftermarket flywheels fitted by a previous owner, so if you are not sure what is in your car, send us the year and VIN before ordering. You can browse other STI and Subaru kits on our rebuild kits page.
| Brand | Competition Clutch |
| Part number | 15030-STOCK |
| Fits | Competition Clutch 04-20 Subaru STi Stock Clutch Kit |
| Vehicle fitment | Subaru Sti Stock (2004-2020) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Competition Clutch lists it for the 2004-2014 Impreza WRX STI and 2015-2021 WRX STI with the 2.5L turbo. It is not for the non-STI WRX.
No. It is an OE-style kit rated for stock torque with a factory pedal feel, meant for stock cars or basic bolt-ons. Tuned cars should look at the Stage 3 or Stage 4 kits.
No. You get the pressure plate, organic full-face disc, throwout bearing, pilot bushing and alignment tool. Resurface or replace the flywheel at install, which the maker requires for warranty.
The pilot bushing and throwout bearing are in the kit. Check the rear main seal, the release fork and pivot, and the slave cylinder, and bleed or flush the clutch fluid.
Yes. Competition Clutch says to shift as often as possible during the first 500 miles so the disc material beds into the pressure plate and flywheel.
