Exhaust will give you a very real performance gain! The problem is that to see it you have get a FULL performance system. A muffler or axle back wont do much for you...look into a cat back system at the least. We really need a 3" downpipe, 3" cat, 3" piping and NO mufflers. That will give you close to 15hp or more most likely on a turbo charged car.
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My Cruiser is slow. I love the law.
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