the stock down pipe is the restriction, headers give you a 3 inch to the res. and your done. unless you got a turbo or some insane m90 build. then a full 3" cat back would be worth the money.
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12-18-2016
the stock down pipe is the restriction, headers give you a 3 inch to the res. and your done. unless you got a turbo or some insane m90 build. then a full 3" cat back would be worth the money.
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