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it's all about how restrictive your current system is. On mustangs up until 2005, replacing the stick cat back system with a mandrel bent system and good free flowing mufflers was not only worth 5-15 up, but also gained a nice bit if low end torque to boot.
05 and up stangs have a much more efficient exhaust system stock, this making an upgrade useless.
My advice is to find a forum dedicated to your particular car and do some research. FYI a straight flow through muffler is the most efficient type.
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