yep go to ur local parts store and look in the chiltons manual.. The one with the red gtp on the front cover and it has compression ratios ,hp ratings .. If I had my car here I'd tell you which page lol and the mufflers are goin the rite direction jus upside down .. Not flipped around to where the exit is wrong way.. But who knows mayb the shop did **** up and put it backwards I hav never really thought bout that before and could make sense why I hav flow probs