installed 6 puck unsprung disc with a centerforce p.p. I also threw in a shim half the size that was in there already. All i can say is DAMN car grabs when it goes in gear.. Way diff then the street disc and the centerforce p.p is a lot softer then the act 2600 i had in there. overall i like the 6 puck unsprung over street disc just because it hits the gear and grabs. still taking it easy though, untill i get my timing belt service done.