Clutch Masters 04-11 Subaru WRX Sti 2.5L Eng. 6-Spd FX250 Clutch Kit
The Clutch Masters FX250 (15017-HD0F) is a step-up street clutch for the 2004-2011 Subaru WRX STI with the 2.5L turbo engine and six-speed manual. It suits an STI with a tune, downpipe and intake that now slips under boost, or a car that sees spirited canyon driving and the occasional track or autocross day, where the owner still wants a clutch that feels close to stock in daily traffic.
The FX250 uses a hybrid disc. Clutch Masters puts its Fiber Tough friction material on the side that contacts the pressure plate and steel-backed organic material on the flywheel side, then clamps it with the Power Plus I heavy-duty pressure plate. The result is a rated 110 percent increase in holding capacity over stock, which Clutch Masters says is more than a traditional full-face Kevlar disc while keeping the street-friendly feel of its FX100 and FX200 kits. A heavy-duty sprung hub and a Marcel spring wafer under the facings soften engagement, so takeoffs stay smooth instead of grabby.
That places the FX250 between the long-life FX200 Kevlar kit and the ceramic FX400. It is the stage Clutch Masters describes for the street enthusiast or weekend racer with a spirited driving style who plans to abuse the car occasionally. Because the facings are organic-based rather than ceramic, the disc tolerates daily use far better than a puck disc.
Start with the hydraulics: check the fluid level and condition, and look for leaks at the slave cylinder on the bellhousing. A soft pedal or a car that grinds into gear points to release problems, not a worn disc. To check for slip, pull in fourth from about 2,500 rpm at full throttle and watch whether engine speed spikes as boost builds. Our slipping diagnosis guide explains how to separate clutch slip from other causes, and shift flare vs. slip covers how the symptoms differ.
Our listing covers the 2004-2011 WRX STI 2.5L six-speed. The Clutch Masters chart for 15017-HD0F extends to the 2004-2021 WRX STI 2.5L turbo six-speed and adds the 2006-2009 Legacy GT spec.B 2.5L turbo six-speed. The five-speed WRX uses a different clutch and is not covered. If your STI is a later year or has had the transmission or flywheel changed, send us the year and VIN and we will confirm fitment. Browse the full rebuild kits and clutch collection for other STI parts.
| Brand | Clutch Masters |
| Part number | 15017-HD0F |
| Fits | Clutch Masters 04-11 Subaru WRX Sti 2.5L Eng. 6-Spd FX250 Clutch Kit |
| Vehicle fitment | Subaru Wrx Sti (2004-2011) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
It is a hybrid: Fiber Tough material on the pressure plate side and steel-backed organic material on the flywheel side, on a sprung hub with a Marcel spring wafer.
Clutch Masters rates the FX250 at 110 percent more holding capacity than stock, above its FX200 Kevlar kit and below the ceramic FX400.
Clutch Masters lists it for the WRX STI 2.5L turbo six-speed from 2004 through 2021 and the 2006-2009 Legacy GT spec.B. Our listing names 2004-2011, so send us the year and VIN for later cars and we will confirm.
Yes. Clutch Masters designed it to keep the street-friendly feel of its FX100 and FX200 kits while adding holding capacity, so it suits a tuned daily driver that sees occasional hard use.
The kit includes the release and pilot bearings. Resurface or replace the flywheel, check the release fork and pivot, and bleed the clutch hydraulics with fresh fluid.
