ACT 2010 Subaru Impreza HD/Race Sprung 6 Pad Clutch Kit
The ACT SB11-HDG6 is aimed at the turbo Subaru owner who needs a clutch that will not slip under boost but does not want a leg-workout pedal. It pairs ACT's Heavy Duty pressure plate with a 6-pad sprung ceramic race disc and an XACT Streetlite flywheel, all in a 240mm package. Our listing is filed under the 2010 Impreza, which here means the 2.5L turbo WRX, not the non-turbo 2.5i. ACT also catalogs the same kit for the Legacy GT, Outback XT, Forester XT, Baja Turbo and the later FA20 and FA24 WRX.
These cars leave the factory with a 230mm clutch. ACT builds the SB11 family as conversion kits that step up to a 240mm disc, so the stock flywheel cannot be reused and ACT's 600890 Streetlite flywheel is supplied in the box. The bigger friction diameter adds holding power and gives heat more surface to spread across.
The HD in the part number is the plate. ACT rates this combination at 574 ft-lb at the crank, 86 percent over the original clutch, and describes the pedal as light to moderate. That is the key difference from the SB11-XTG6, which uses the stiffer Xtreme plate for 681 ft-lb with a heavier pedal. The disc is the same style either way: six ceramic pads on a sprung hub, so engagement is grabby and shifts are quick. ACT lists the kit weight at 29 lb.
Kit contents per ACT: 600890 Streetlite flywheel, SB020 Heavy Duty pressure plate, 6240518 6-pad sprung race disc, RB846 release bearing, PB1004 pilot bearing and AT90 alignment tool, plus M8-1.25 x 16mm plate bolts.
Run a high-gear slip test: from roughly 2,500 rpm in fourth, go to full throttle and watch the tach against the speedometer. Our slipping diagnosis guide explains what a true slip looks like, and the flare vs. slip guide helps rule out other causes. Before blaming the disc, check that the clutch pedal returns fully and the slave cylinder is not holding the fork partly applied, and look for oil at the engine-to-transmission seam. A leaking rear main seal will ruin a new ceramic disc in short order.
ACT lists the SB11-HDG6 for the 2006-2011 Impreza WRX 5-speed, 2012-2014 Impreza WRX and WRX 5-speed, 2005-2012 Legacy GT (5- and 6-speed), 2005-2009 Outback XT, 2006-2008 Forester XT, 2006 Baja Turbo, 2015-2021 WRX 2.0L turbo 6-speed and 2022-2026 WRX 2.4L turbo 6-speed. The US-market STI is not on the list. ACT also warns that Subaru moved to 240mm clutch components in mid-2018 model year production starting at VIN J806877, and ACT kits and flywheels do not fit those revised parts. Owners of 2018 and newer WRXs should send us the year and VIN before ordering. More Subaru clutch options are in our rebuild kits and clutch section.
If you want the same plate with a smoother organic disc, look at the SB11-HDSS street kit. If the HD plate is not enough clamp for your power level, the SB11-XTG6 steps up to the Xtreme plate.
| Brand | ACT |
| Part number | SB11-HDG6 |
| Fits | ACT 2010 Subaru Impreza HD/Race Sprung 6 Pad Clutch Kit |
| Vehicle fitment | Subaru Impreza Hd/Race Sprung 6 (2010) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Both use the same 240mm 6-pad sprung race disc and Streetlite flywheel. The HDG6 has the Heavy Duty plate rated 574 ft-lb with a light to moderate pedal; the XTG6 uses the Xtreme plate rated 681 ft-lb with a heavier pedal.
Yes, and it is included. ACT calls this a conversion kit that replaces the 230mm factory clutch with a 240mm system, and the ACT 600890 Streetlite flywheel must be used.
No. ACT does not list the US-market STI for this kit. It is for the WRX, Legacy GT, Outback XT, Forester XT and Baja Turbo applications listed above.
Possibly not. Subaru changed to 240mm clutch parts mid-2018 model year starting at VIN J806877, and ACT says its kits are not compatible with those revised components. Send us your year and VIN to check.
It works, but engagement is abrupt and there can be mild gear rattle at idle. ACT recommends it for high horsepower street or race use. If the car is mostly a commuter, an organic disc kit is easier to live with.
