ACT 06-25 Subaru WRX XT/Race Sprung 6 Pad Clutch Kit
The ACT SB12-XTG6 is a 240mm Xtreme pressure plate and 6-pad sprung race disc kit for the turbocharged Subaru WRX, 2006 through the current car, plus the Legacy GT, Outback XT, Forester XT and Baja Turbo that share the drivetrain. It is the kit for a built WRX that slips under boost, burns through street clutches at the track, or is making far more torque than the factory 230mm clutch was sized for.
ACT builds the SB12 family as a direct-replacement upgrade from the factory 230mm clutch and flywheel to a larger 240mm system with more heat capacity. Per ACT, the kit includes a chromoly XACT Prolite flywheel (#600895), the clutch hardware, a release bearing and an alignment tool, so the flywheel is part of the package rather than a separate purchase. Pressure plate bolts (M8-1.25 x 16mm) are supplied.
The XTG6 pairing is the aggressive end of the range. The Xtreme pressure plate uses ACT's heat-treated diaphragm for high clamp load, and the 6-pad sprung disc uses ceramic friction pads with a spring center to soak up torsional vibration. ACT rates it at 681 ft-lb at the crank, 121 percent over stock, and describes the feel as moderate to heavy pedal effort with aggressive engagement. ACT's own guidance is that Xtreme plates raise pedal effort roughly 50-80 percent. This is a high-horsepower street or race clutch, not a commuter clutch.
Run a controlled slip check in a higher gear from low rpm at full throttle and log engine speed against vehicle speed; a gap that opens as boost builds means the clutch is slipping. Our slipping diagnosis guide covers the method. Also check that the clutch hydraulics release and return fully, since a sticking slave or air in the line can cause both drag and partial slip. Be honest about use: if the car is mostly a daily driver, the organic-disc SB12-HDSS street kit is easier to live with, and our manual repair cost guide helps budget the job.
ACT lists the SB12-XTG6 for the 2006-2014 Impreza WRX (2.5L), the 2015-2021 WRX (2.0L turbo), the 2022-up WRX (2.4L turbo), the 2005-2009 Legacy GT and Outback XT, the 2010-2012 Legacy 2.5GT, the 2006-2008 Forester XT and the 2006 Baja Turbo. It is not for the WRX STI, which uses a different gearbox and clutch. Because the kit spans several engines and gearboxes over two decades, confirm your exact model and transmission and send us the year and VIN if you want us to check before ordering. Related parts are in our rebuild kits and clutch section.
Expect firm pedal effort, quick and abrupt engagement, and some gear rattle. If you want the same plate with a smoother disc, the SB12-HDG6 heavy-duty race kit is a step down in clamp load.
| Brand | ACT |
| Part number | SB12-XTG6 |
| Fits | ACT 06-25 Subaru WRX XT/Race Sprung 6 Pad Clutch Kit |
| Vehicle fitment | Subaru Wrx Xt/Race Sprung 6 (2006-2025) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes. ACT says the SB12 kits include a chromoly XACT Prolite flywheel #600895, the clutch hardware, a release bearing and an alignment tool, along with M8-1.25 x 16mm pressure plate bolts.
No. ACT lists it for the non-STI WRX plus the Legacy GT, Outback XT, Forester XT and Baja Turbo. The STI uses a different gearbox and clutch.
ACT rates the SB12-XTG6 at 681 ft-lb measured at the crank, 121 percent over the factory clutch.
It can be driven on the street but it is aggressive. ACT describes moderate to heavy pedal effort and aggressive engagement, with Xtreme plates raising pedal effort roughly 50-80 percent. For a daily driver, the organic-disc SB12-HDSS is the easier choice.
ACT says race discs usually need only a few hard slips to lap in the surfaces before normal use. Do not overheat the clutch during break-in or the surfaces can glaze.
Replace the pilot bearing, use new flywheel bolts, check the release fork and pivot, and bleed the clutch hydraulics with fresh fluid.
