You MIGHT get 5 hp out of a set of mufflers. Perhaps 10-12 out of a full cat back system. Whether you're just buying new mufflers to weld in, or a whole cat-back, shop by sound not HP. The differences in HP are minimal, but differences in sound are dramatic. Pick the ones you like to listen to -- you'll have to listen to them for a long time.
flowmaster=more HP?
Does anyone how much HP Flowmaster adds?. Is there diff. kinds? I haven't got that part down yet. I read about 15rwhp,but then I read that it could go up 40+rwhp? little confused.
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