ACT 13-23 Subaru WRX Mod-Twin 225 XT Sprung Street Clutch Kit
A tuned Subaru WRX makes torque early and hard, and once the boost comes up the factory clutch is usually the first part to give up. If your 2013-2023 WRX flares the revs in third and fourth at full boost, smells hot after a few launches, or you are planning a bigger turbo and do not want to do the clutch twice, ACT T2SS-S01 is the step past a single disc. It is the Mod-Twin 225 with ACT's Xtreme pressure plate and a sprung hub, rated by ACT at 710 ft-lb at the crank, and it is meant to be driven on the street every day.
Instead of one larger disc, the Mod-Twin stacks two 225 mm (8.8 inch) steel-backed organic friction plates with a floater between them, so the clutch has twice the friction surface inside a package that fits the WRX bellhousing. The Xtreme diaphragm spring adds clamp load on top of that, which is why ACT puts this kit at 126 percent more torque capacity than the original clutch. Both friction plates drive a single sprung Mono-Drive hub. That spring center is what keeps a twin disc civil in an AWD car: it absorbs the torsional shock that otherwise goes straight into the input shaft, center differential and axles. ACT describes the feel as soft, progressive engagement with OE to mild gear noise, and lists it for street or street/strip use. The kit ships with a CNC-machined, balanced flywheel, cover, diaphragm, floater, Monoloc collar, release bearing, alignment tool and a pilot bearing if your car needs one. Weight is 27.3 lb, and the input spline is 1 inch.
Do a simple slip test: in fourth gear at about 2,500 rpm, go to full throttle and watch the tach. If the needle jumps ahead of road speed, the clutch is slipping. Before blaming the disc, check the hydraulics for a soft or sinking pedal and make sure the pedal returns fully, since a dragging master or slave cylinder causes hard shifts that feel like a worn clutch. Our slipping diagnosis guide walks through separating clutch slip from internal transmission problems, and our manual repair cost breakdown shows what a clutch job usually runs if you are paying a shop.
This listing covers the 2013-2023 Subaru WRX (not the STI, which uses a different gearbox and clutch). That span covers three different engines: the 2013-2014 cars run the 2.5 liter turbo with the 5-speed, 2015-2021 cars run the 2.0 liter direct-injected turbo with the 6-speed, and 2022-up cars use the 2.4 liter turbo. ACT's own chart also lists this part number for several 2005-2012 turbo Legacy GT, Outback XT, Forester XT and Impreza WRX models. Because Subaru changed clutch parts during the 2018 model year, send us your year and VIN before ordering a 2018 or later car and we will confirm it against ACT's chart. For other options, browse our clutch and rebuild kits.
Clean the crank flange and use new flywheel bolts torqued to the factory figure, then fit the Mod-Twin stack in the order shown in ACT's instructions and center it with the supplied alignment tool before tightening the cover bolts evenly in a cross pattern. Replace the pilot bearing if your car uses one, inspect the release fork pivot and lube the input spline lightly. Bleed the clutch hydraulics with fresh fluid of the type marked on your reservoir cap. ACT recommends 300-500 miles of gentle driving to bed in organic discs, so no launches until then. Expect a firmer pedal: ACT says Xtreme pressure plates typically add 50-80 percent pedal effort. If you want a lighter pedal and your power is under about 625 ft-lb, the Mod-Twin 225 HD version (T1SS-S01) is the same design with the Heavy Duty plate. Another twin option is the XClutch 10.5 inch twin sprung organic kit for 2018-2021 cars.
| Brand | ACT |
| Part number | T2SS-S01 |
| Fits | ACT 13-23 Subaru WRX Mod-Twin 225 XT Sprung Street Clutch Kit |
| Vehicle fitment | Subaru Wrx Mod-Twin 225 (2013-2023) |
| Type | Clutch Kits - Multi |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. This listing is for the 2013-2023 WRX. The STI uses a different 6-speed and clutch, and needs an STI-specific kit.
ACT rates the Mod-Twin 225 XT Sprung Street kit at 710 ft-lb measured at the crank, 126 percent over the original clutch.
Yes. ACT includes a CNC-machined, dynamically balanced flywheel along with the cover, diaphragm, two friction plates, floater, sprung Mono-Drive hub, release bearing, alignment tool and pilot bearing if needed.
ACT says its Xtreme pressure plates usually add 50-80 percent pedal effort depending on the car. The HD version, T1SS-S01, typically adds 15-40 percent.
ACT describes OE to mild transmission gear noise with soft, progressive engagement. The sprung hub is what keeps it quieter and smoother than a rigid twin disc.
Yes. ACT says Mod-Twin clutches are fully rebuildable and most components can be ordered separately, so a worn kit can be refreshed without replacing the flywheel.
