^ you corrected him on using "headers" and then used the same word in your own postangelplus said:ok... well first off, we have one HEADER. please get it right people, we have 4 bangers lol.
Hell, Im running nitrous with out headers and with a stock exhaust!!!!![]()
You won't see any big difference from cat-back exhaust, header and high flow cat combined. I didn't see much of any REAL difference.
At this point, engine swaps (H22) and forced induction (turbo or nitrous) are the only real ways to get bang-for-the-buck gains out of an I4 6th gen, IMO. Don't expect any sort of big gain from simple bolt-ons because you will be dissapointed if you do.