ok guys, i've been on this board way before i joined, but i have a question. running a 3.5 pulley on a 98 gtp 214k miles, runs great. just now added headers(had plog and d/p)3" DP AND 2 .5 EXHAUST PIPE TILL the "y", ported s/c inlet and outlet, tb and homaid 4" fwi. also plugs t-stat.,f.p. rewire, lastly intense stage 1(?) pcm mailorder tune. i previosly(before headers) had 2* kr or so. if i swap pullies, i need to have pcm looked at, or should i just tell ti greatly increase timing(now 14*) and keep the 3.5? yeah me too. just wandering, thinking of going 3.3 and staying there.....advice??? happy thanksgiving guys!!!!!!!
