hey i got the slp cat back on my car and the sound is sweet... i' mgoing to get the catted...because a stock gt engine needs the back pressure...the o/r x u might lose hp... now as the mods keep coming you can always remove the cats and install a straight pipe to make it an o/r pipe
http://www.mustangtuning.com/slprapi946mu.html
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Installed: Ford C Springs, Mach1 chin & grille delete, SLP Cat-back, Bilstein shocks, UPR short shifter, Steeda CAI, Steeda Underdrive Pully, SCT tunerII, 5.0 Forged Stoker Kit
Future: Upgrade suspension and brakes, new Heads, Kenne Bell SC
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