ACT Xtreme Duty Performance Street Disc Clutch Kit - 2004-2021 Subaru STI / 2007-2009 Legacy GT spec.B
ACT Xtreme Duty Performance Street Disc Clutch Kit - 2004-2021 Subaru STI / 2007-2009 Legacy GT spec.B
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
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ACTSB10-XTSS
ACT
ACT Xtreme Duty Performance Street Disc Clutch Kit - 2004-2021 Subaru STI / 2007-2009 Legacy GT spec.B
ACT Xtreme Duty Performance Street Disc Clutch Kit - 2004-2021 Subaru STI / 2007-2009 Legacy GT spec.B
Couldn't load pickup availability
SB10-XTSS kit features an Xtreme pressure plate for the most demanding driver. ACT Xtreme pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency.
ACT's Performance street discs are the most popular disc purchased. They feature premium organic materials with higher copper content for better heat transfer and steel-backed lining for greater burst strength and durability. These discs feature a reduced marcel for faster shift action to complement ACT pressure plates. Quiet operation with increased strength and reliability. Monoloc is a one-piece, direct replacement or upgrade to the standard, two-piece wedge collar and wire ring featured in pull-type clutches. The spring tension of the segmented retaining ring is carefully calculated and tested for optimal performance. It provides uniform loading on the bearing and pressure plate to assure proper alignment, regardless of driver influence or vehicle modifications. Monoloc's hardened chrome-moly steel construction will provide years of service.
Rated for 565 ft/lbs torque.
Feel
A moderate to stiff pedal feel; smooth engagement with stock to low gear rattle. Monoloc provides uniform loading on the bearing and pressure plate to assure proper alignment, regardless of driver influence or vehicle modifications.
Life
Longer clutch life achieved through ACT's exclusive diaphragm design. Monoloc's hardened Chrome-moly steel construction will provide years of service.
Quality
Premium organic friction materials for heat tolerance, faster recovery from overheating and prevents warping of mating surfaces. The spring tension of the segmented retaining ring is carefully calculated and tested for optimal performance.
Recommended Use
Recommended for street and race use
ACT Difference
All ACT pressure plates are dynamically computer balanced for smooth operation at high RPM. Monoloc is a one-piece, direct replacement or upgrade to the standard, two-piece wedge collar and wire ring featured in pull-type clutches.
Warranty
1 Year from retail purchase
Includes
- Sprung Disc
- Heavy Duty Pressure Plate
- Alignment Tool
- Pilot Bearing
- Release Bearing
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Fits
2015 Subaru STI ACT Xtreme Monoloc Performance Street Sprung Clutch

| Specification | Value |
|---|---|
| Clamp Load Increase | 0.6 |
| Crank Torque Capacity | 565 Ft/Lbs |
| Disc Material | Organic |
| Disc Style | Sprung Hub |
| Disc Type | Disc |
| Flywheel Included | No |
| Pressure Plate Style | Pull |
| Wheel Torque Capacity | Not Provided |
| Alignment Tool Included | Yes |
As others have mentioned, the pedal feel is a bit more stiff than with the stock/OEM clutch. It takes some time to get used to, but it's worth it - especially considering the engine torque that this kit is rated for. If you are planning to add serious power mods in the future, or you just want a more sporty feeling/better performing clutch than look no further - this is the one. It strikes a good balance between comfort and performance, providing great responsiveness and feedback while still being comfortable enough for daily driving.
This Act clutch kit is the best you can get the performance response that it gives to the crank is awesome. Every shift is accurate is a little heavy on the pedal but that's effective for a good power response for the performance of the car