Yep, just go custom. You can get a whole system from the headers back done for the same price or less as the cat-back stuff that most places sell. The Supersprints and other designs are also a lot more mellow than some of the custom stuff you could do, I don't know how extreme you want to get.
There are very little, if any, power gains on an exhaust in our cars (in stock form, anyways ) - you do it for looks and sound.
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