Competition Clutch Subaru 06-16 WRX 2.5L Push Style 230mm Stage 4 6 Pad Ceramic Clutch Kit
The Competition Clutch 15021-1620 is a Stage 4 six-pad ceramic clutch kit for the 2.5L turbo Subaru WRX with the 5-speed manual and its push-style release. It is listed here as the 230 mm push-style kit, and no flywheel comes in the box. This is for the WRX that has already outgrown a Stage 2 or Stage 3: a big-turbo EJ255, high boost on E85, or a car that sees drag strip launches and keeps burning through softer discs.
On the 5-speed WRX, the release bearing pushes the pressure plate diaphragm toward the engine to free the disc. This kit replaces that assembly with a Competition Clutch performance pressure plate and a sprung disc carrying six ceramic pucks. Competition Clutch calls it part of its Strip Series and rates the Stage 4 at up to 250 percent more torque capacity than stock. The -1620 suffix is the sprung-hub disc; the maker notes that -0620 part numbers are the solid-hub version. The sprung center takes some of the shock out of hard launches before it reaches the gearbox and axles.
The trade is drivability. Six small ceramic pucks concentrate clamp load on a small friction area, so engagement is quick and close to on or off. Expect more care pulling away in traffic and on hills than with an organic or brass disc. If most of your miles are on the street, the 15021-2100 Stage 2 kit covers the same cars with a full-face disc.
The maker's spec table lists the kit with a throwout bearing, a pilot bushing and an alignment tool, a single ceramic 6-paddle disc, and no flywheel.
On a stock or lightly modified WRX this kit is the wrong choice. It will feel harsh and gives up comfort for holding power you do not need.
Do a full-throttle pull in fourth from about 2,500 rpm on a safe road. If the tach races ahead of road speed as boost builds, the disc is slipping. Our slip diagnosis guide covers the test, and the clutch slipping causes page explains other causes to rule out. Check for a weeping slave cylinder and oil on the bellhousing first; either one will make a good clutch slip.
Our listing covers the 2006-2016 Subaru WRX 2.5L turbo 5-speed. Competition Clutch's own page describes the kit for the 2006-2014 WRX and the 2005-2009 Legacy GT 2.5L 5-speed, and its title also names the 2005-2008 Forester 5-speed. The 2015-up WRX uses a 2.0L engine and a 6-speed with a different clutch, and the WRX STI 6-speed is also different, so neither fits. If you have a 2009-up car, a Legacy GT, a Forester XT or a swapped drivetrain, send us the year and full VIN before ordering. Some Competition Clutch copy for this family mentions a larger 250 mm setup with a flywheel; that is the 15026-1620 Stage 4 kit with steel flywheel, not this one.
| Brand | Competition Clutch |
| Part number | 15021-1620 |
| Fits | Competition Clutch Subaru 06-16 WRX 2.5L Push Style 230mm Stage 4 6 Pad Ceramic Clutch Kit |
| Vehicle fitment | Subaru 06-16 Wrx (2006-2016) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. The maker's spec table lists the pressure plate, six-pad ceramic disc, throwout bearing, pilot bushing and alignment tool, with no flywheel. Resurface yours or add the 2-723-ST steel flywheel.
No. The 2015-up WRX has a 2.0L engine and a 6-speed with a different clutch. This kit is for the 2.5L turbo 5-speed cars.
It can be driven on the street, but engagement is quick and not very forgiving. If the car is a daily driver with moderate power, a Stage 2 full-face disc is easier to live with.
Competition Clutch uses -1620 for the sprung-hub six-pad disc and -0620 for the solid-hub version. The sprung hub absorbs more driveline shock.
Competition Clutch says to shift as often as possible for the first 500 miles and avoid launches, so the disc material embeds into the pressure plate and flywheel surfaces.
