Competition Clutch 06-16 Subaru WRX Stock Clutch Kit
If your 2.5L turbo WRX has started slipping in third and fourth when boost comes on, the pedal now bites near the top of its travel, or the car shudders backing up a driveway, the factory clutch is simply worn out. Competition Clutch 15021-STOCK is an OE-style replacement for the EJ255 five-speed WRX, Legacy GT and Forester XT. It is meant to give a stock or lightly modified car its factory feel back, not to turn it into a race clutch.
The five-speed WRX uses a single dry disc between the flywheel and a diaphragm pressure plate, released by a fork and throwout bearing. When the disc facing glazes or wears thin, clamp load drops and the turbo torque spike in the midrange is the first thing it can no longer hold. This kit replaces all of the wear parts at once: an OE-style pressure plate, an organic full-face disc, the throwout bearing, the pilot bushing and an alignment tool. Competition Clutch rates it at the original torque capacity with a factory pedal feel, which is exactly what you want on a car with an intake, exhaust and a mild tune. If the car has a bigger turbo or makes well past stock torque, skip this kit and look at the 15021 Stage 2 Brass Plus kit instead.
Put the car in fourth around 2,500 rpm and roll into full throttle. If the tach jumps ahead of the speedometer as boost builds, the disc is slipping. Rule out the cheap causes first: check the clutch fluid, bleed the system if the pedal feels soft, and look at the bottom of the bellhousing for oil from the rear main seal, which will contaminate any new disc. Our slipping diagnosis guide covers how to separate real slip from other problems, and clutch slipping causes and fixes goes deeper on manual clutches specifically.
Our listing is titled for the 2006-2016 WRX. Competition Clutch lists 15021-STOCK for the 2006-2014 WRX and 2005-2009 Legacy GT with the 2.5L turbo and five-speed, and its catalog title also adds the 2005-2008 Forester. The 2015 and later WRX uses the 2.0L turbo with a six-speed and takes a different clutch, so this kit is for the EJ255 five-speed cars. STI models also take a different kit. Many of these cars have had a transmission swap or an aftermarket flywheel fitted by a previous owner, so if you are not sure what is in yours, send us the year and VIN before you order. You can compare other Subaru kits on our rebuild kits page.
| Brand | Competition Clutch |
| Part number | 15021-STOCK |
| Fits | Competition Clutch 06-16 Subaru WRX Stock Clutch Kit |
| Vehicle fitment | Subaru Wrx Stock (2006-2016) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Competition Clutch's application line is the 2006-2014 WRX and 2005-2009 Legacy GT 2.5L turbo five-speed. The 2015 and later WRX has the 2.0L turbo and six-speed with a different clutch, so send us your VIN if your car is a 2015 or newer.
No. It is an OE-style kit with an organic full-face disc, rated for stock torque with a factory pedal feel. It suits stock cars and basic bolt-ons. Heavily tuned cars should move up to a Stage 2 or higher kit.
An OE-style pressure plate, organic full-face disc, throwout bearing, pilot bushing and alignment tool. A flywheel is not included.
Yes. Competition Clutch requires the flywheel to be resurfaced or replaced at install to keep the warranty. Replace it outright if it is cracked, heat-checked or already machined to its limit.
Look for rear main seal leaks, check the release fork and pivot for wear, and inspect the slave cylinder. Flush or bleed the clutch fluid after the job.
Yes. Shift as often as possible during the first 500 miles so the disc material beds into the pressure plate and flywheel.
