04 sierra ecsb stock everything except cam and cai built 4l60e.the reason im wondering if i should be tweaking anything now yhat id like better is that im installing a s/c next weekend and i know iv got to get a new tune then ,ya know?another words i want max potential before i s/c it so i see diff in s/cin it .i dont want to just put the s/c on it and go wow ,i want to know i had it at max pot before so i feel better about the s/c addind correct h/p .sounds more diff,than i mean.i did the swap to 6.0 blind so i dont know what the tune even did for me besides idles better.sorry about the confusion

oh i do have 285 20s on it .