haha jeez.. that was harsh. anyways, 3'' would provide more free flowing exhaust but itll probably be a lot louder. 2.5'' isnt too bad in my opinion. i'd go with a nice 2.5''. just have one custom built for your car.
well ...........i thought it was rather obvious...........why not get like six catalytic converters on your exhaust while your at it...cat's help NA performance
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