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I checked the description and the person claims that it will "add horses"...For just an axle back, you really won't see an increase in HP. Although if you just want to add this for the sound, that's something else.
Maybe you could try going to a local muffler place and see what they can do for you? I got mine custom-made for $500 (x-pipe, 2.5" tubes, Magnaflow mufflers). Little to no drone on mine and it added a good 10 rwhp!
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