Thread: 3" or 2.5"

isnt the 2.5" goona keep my torque lower on the charts. im gonna have zzp high flow 2.5"dp, 3.5 pulley, tr6 plugs, zzp cai, undecided on which headers to get opinions? and same story for pcm thinking zzp tho?? this set up i shouldnt see kr and be pretty reliable rite?

Listen to what these guys are saying...3" down pipe OR for a little bit more get the speed daddy headers and have more flow.