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ACT's Performance Street (SS) friction surface is SFI certified and is an excellent choice for modified, street driven cars. The SS disc provides quicker engagement than a stock surface and is quiet compared to other, more aggressive friction surfaces. The SS disk is available coupled to the Heavy Duty pressure plate for a 41% increase in clamp load, or the Xtreme pressure plate which increases the clamp load by 57%. ACT's Performance Street disk uses a sprung hub with bushings and cone springs similar to OEM clutch discs; creating frictional dampening that improves clutch life and reduces noise. The SS kit is suggested as a stock replacement or for light to moderately modified 04-07 Subaru STI's.
Torque Rating: 515 ft/lbs
Part Number: SB4-HDSS
Great clutch!
by: Steve
Just picked up this clutch in conjunction with full exhaust and 850cc injectors for my 05 STI. The clutch is very smooth during shifts, it does have a shutter during engagement from a stop in first gear. It doesn't make any noise, and the pedal feel is pretty much a stock feel. I really like it!