I have a 2000 3.9V6 so far I have a single in single out 40 series, airaid intake, poweraid TB spacer, and soon to be headers(ceramic) and a programmer(possible TB upgrade as well. Heres the question: has anybody else done this? if so was it a good upgrade, has anybody done a dyno run to see what the gains over stock is???? LET ME KNOW PLEASE.