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With performance bein what Im used to messin with, and MPG bein somethin new to me I still feel like I can safely say that your overthinkin this. I think you could actually spend less time and money and put together a well thought out, performance AND MPG based exhaust system that allowed more power and efficiency. Headers, high flow cat, decent muffler (NOT A FLOW THRU FART CANNON) all on the right sized pipe should open up more than a couple HP and allow you a bit more efficiency (if you can keep your foot out of it lol).
Matt
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