Did you test it on the same day? Prove your statement dichead. The extra cost is well worth it, a satement coming form a moron that blew his engine up. Thats why I am sick and tired of bull**** information posted by you. I fell for the trap, ended up costing a bit to buy a "proven" exhaust. For a while I believed it, even believed my own lies to make myself feel better, only to realise what a waste of money it really was, because cockheads like you talk it up. I wont stand by this bull**** no more so others wont fall for it. You should moderate yourself off the forum and stick to moderating. Unless you have proof dont post it. why don't u post yupur proff that it doesn't work?? i knwo ive seen dylan go from a 15.2 with intake and then installed ces exhaust and got to a 14.8 Thats enough proof for me :P I thik the more constructive comments about different products the better. Tell ppl there dicheads for beleiving in a product is not constuctive.