i have stage two installed and i am looking for a catless downpipe what would be the best one to get? i have read 3" i have read 2.5" what make all that fun stuff. i plan on only keeping the stage 2 i am upgrading the clutch and at the same time its on the lift i want to do the downpipe but not sure which one to get any help would be appreciated........i am leaning towards the zzp 2.5 and i have an 06 ss