ACT 2006 Subaru Impreza 4 Pad Sprung Race Disc 2011-subaru-impreza-outback sport we add an 11mm ARP

we add an 11mm ARP 625+ head stud set and all required gaskets for the final valve cover-to-valve cover assembly

With the 4-pad spring-centered race disc

Once the Centroid completes the port process the heads receive our combustion chamber modification (depending on option choice) in which the shapes of the chamber are machined to reduce compression and improve the burn path

ACT 1991 Subaru Legacy 6 Pad Rigid Race Disc

The heads decks are then resurfaced using our TS-3000 BlockMate that cuts the aluminum to a smooth even finish

ACT 2006 Subaru Impreza 4 Pad Sprung Race Disc 2011-subaru-impreza-outback sport we add an 11mm ARPACT 2006 Subaru Impreza 4 Pad Sprung Race Disc Aggressive engagement, quick shifts, OE to mild gear rattle; Premium ceramic friction materials provide moderate wear rates and high heat tolerance; Utilizes wraparound spring windows, thicker retainer stampings and a heat treated, spring steel drive plate to provide support, reduce stress concentrations and increase strength and reliability; Recommended for race use only; High burst strength and holds