I used the ACT for awhile, but it wouldn't hold the boost I wanted run. I then switched to the ACT race disk (4 puck), and within 1 days, nblew up the tranny (it is WAY to harsh for road use, totally on/off with lots of chatter since there are no springs. It did hold the power great, but was obnoxious to drive, and the tranny is not nearly strong enough to hold it. I then switched to a 1996 spec STi-RA tranny (since it uses the same interna;l ratio as the RS box...4.11), coupled with an STi V5 clutch and STi lightweight (14 lb) flywheel. It holds every ounce of boost I have thrown at it, launches great (no slip), and is literally like a stock clutch to drive. great part is that if/when I ever decide I need more, there are endless clutch options for the WRX tranny, whereas the RS one is very limited in selection. Given the scope of work you have on your car to date, I would recommend this route. But then again, you could always go clutchmasters/act till you find you need more (i found 15 psi to be the limit on the ACT), then swap to a WRX box.