trust me i had fm 40s, stock, and muffler-less, and the best sound comes from headers with stock catback...no mufflers set me back alot of power believe it or not, i went from a 14.6 to a 14.9 and had the same mods, just no muffs...and they sounded like crap above idle...
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03 GTP: 06 seats-roof rails-fbody brakes-limited edition gauges-slp spoiler-gmpp exhaust-06 vette tips-
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