You probably wont feel a difference. If anything, you get a 1 to 2 HP increase. I have BBK long tubes, Bassani O/R X pipe and Flowmasters plus a few more mods that help out the sound:armintheman said:Thanks for the clips, I've never herd a mustang with dumped exhaust, so its deeper than regular exhaust, and do you feel a diff. as far as acceleration? also do you have an O/R x pipe or stock H-pipe?