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If you read up on exhaust design you will quickly learn that bigger is not always better, exhaust fallows the same rules as a musical instrument does because it's a pulsating flow, It's about the math not the "restriction" unless of course you don't believe in math.
With a vehicle of your size and I imagine you would like to keep the look of the vehicle as much as possible, then I would start with synthetic fluids all around, an aluminum belly pan is going to help smooth air flow on the rough underside is going to help alot at highway speeds, also going with the next step narrower in tire sizes at max side wall pressure is another proven way to help.
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