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duhhh...a performance muffler is way better than
a factory muffler! the muffler is the most
restrictive componant on your exhaust system. you need a
strait through muffler. this will give you better air
flow and a little bit more horse power. if you want a
lot of difference in speed and horsepower go with new
headers and a cat-back exhaust system. good luck man...
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