I Have factory manifolds, mid pipe with cats and magnaflow axle backs on my S197 right now. My car is running 5 PSI on a Vortech, non intercooled setup, but it is corked up like crazy, even though it was already dyno tuned before. Not in a situation to afford headers so i picked up some muffler deletes to see what would happen. Will i lose or gain horsepower with this setup? Should i retune it also? Any feedback would be much appreciated
