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I just put on my Bassani X-pipe w/cats and a SLP Loudmouth I catback on my 01 GT. THe car sounds a heck of alot nicer and louder. I can feel a little bit of a change, but will i notice a differance in my track times? I talked to some guys at my work who had mustangs and they said i should see a change. Let me know what you guys/girls think.
You'll probably see .2 to .3 tenths off your 1/4 mile times with the open exhaust. But with your engine exhaling better, you need some intake mods. You'll notice a decent gain with a tb/plenum combo and a cai. I bet your car sounds pretty good man.