ACT 2006 Subaru Impreza HD-M/Race Sprung 6 Pad Clutch Kit
ACT SB10-HDG6 is the Heavy Duty race clutch with Monoloc for the Subaru WRX STI six-speed, listed here for the 2006 Impreza WRX STI. It sits between ACT's organic street kits and the Xtreme race kit: a good match for STIs with a larger turbo, ethanol tune or regular track and launch use, where an organic disc slips or fades but the owner does not want the heavier pedal of an Xtreme pressure plate.
Inside is ACT's SB019 Heavy Duty pressure plate and the 6240618 six-pad, spring-centered ceramic race disc. ACT rates the package at 668 ft-lb at the crank, 88 percent over the factory clutch, on a 9.4 in (240 mm) disc with a 1 in input shaft. The ceramic pads tolerate far more heat than an organic facing, and the sprung center still damps torsional shock into the gearbox, but engagement is aggressive; ACT lists light to moderate pedal effort with aggressive engagement.
The M in HD-M stands for Monoloc. The STI six-speed uses a pull-type release, and the factory design holds the release bearing to the pressure plate with a two-piece wedge collar and wire ring. ACT's Monoloc replaces that with a one-piece hardened chrome-moly retainer designed to load the bearing evenly and keep it aligned, which ACT credits with a dramatic improvement in release mechanism life.
The kit contains the SB019 pressure plate, 6240618 disc, RB601 release bearing, PB1004 pilot bearing and AT90 alignment tool. No flywheel is included.
Check the hydraulics and pedal free play first, since air or a tired slave cylinder can mimic a worn clutch. To test for slip, hold fourth gear near 2,500 rpm and apply full throttle; if engine speed outruns road speed as the turbo spools, the clutch is not holding the torque. Walk through it with our transmission slipping diagnosis guide and read shift flare vs. slip if you are unsure what you are feeling. A pedal with no resistance and no release usually means the release bearing has separated, which requires pulling the transmission.
Our listing is titled for the 2006 Subaru Impreza and covers the 2006 WRX STI six-speed. ACT's application chart for SB10-HDG6 runs from the 2004-2014 Impreza WRX STI through the 2015-2021 WRX STI, plus the 2007-2009 Legacy GT spec.B and 2002-2005 JDM STI models. It does not fit the five-speed WRX or non-turbo Impreza. If the car has had a transmission swap, confirm what is in it, or send us the year and VIN. Other Subaru clutch and flywheel parts are in our rebuild kits and clutch section.
| Brand | ACT |
| Part number | SB10-HDG6 |
| Fits | ACT 2006 Subaru Impreza HD-M/Race Sprung 6 Pad Clutch Kit |
| Vehicle fitment | Subaru Impreza Hd-M/Race Sprung 6 (2006) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Both use the same 6-pad sprung ceramic disc and Monoloc. HDG6 uses the Heavy Duty plate rated 668 ft-lb with lighter pedal effort; XTG6 uses the Xtreme plate rated 766 ft-lb with a heavier pedal.
No. ACT lists SB10-HDG6 for the WRX STI six-speed, the 2007-2009 Legacy GT spec.B and JDM STI models only.
Yes. The kit includes the RB601 release bearing, PB1004 pilot bearing, AT90 alignment tool and the Monoloc retainer with the pressure plate and disc.
A flywheel is not included. Resurface the stock flywheel or use ACT's 600235 Streetlite or 600240 Prolite.
It is a 6-pad ceramic race disc with aggressive engagement. ACT recommends it for high horsepower street or race use, so expect a more abrupt takeoff than an organic disc.
