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[sm=smiley14.gif]I have not screwed with mine, but I find that the Mustang has an awesome exhaust note just right from the factory. The type of exhaust note that is not irritating but at the same time lets everyone know this machine is business.
an open dump exhaust system can actually hurt your engine... things like long tube headers and x-pipes help though... if you don't have serious engine mods you're going to actually probably see a HP decrease from doing this though... these engines like a little back-pressure