with your ACT you'll probably wanna launch lower, the new clutch will grab a lot harder. I used to launch about 5000 on the street with my stock clutch and i/h/e which yielded equivalent 2.21-2.23 60 foots at the track. After my turbo i'm launching around 3200 with an ACT HDSS clutch, i'm still adjusting to my clutch but i'm hoping for 2.1's. Just remember depending on your setup you'll want to change your launch RPM and you want to feather the clutch when you let it out.