ACT Heavy Duty Performance Street Disc Clutch Kit STI (2004-2018) Honda With our new stock replacement

With our new stock replacement downpipes

collecting data and measuring performance

the PERRIN Inlet hose makes a much more gradual bend toward the throttle body making for even less restriction

unleashing horsepower that would normally be restricted

ACT Heavy Duty Performance Street Disc Clutch Kit STI (2004-2018) Honda With our new stock replacementThe SB10 HDSS kit from ACT for the Subaru STI features ACT's most popular Heavy Duty pressure plate and most popular street disc. ACT Heavy Duty 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