not a whole lot you can do about this one as far as MPG . mine has a single flowmaster 40 series (one 3in inlet and 2 2.5in outlets) with dual tips ran out the back, and the k and n FIPK kit but i only noticed a small difference out on the interstate on long trips(more miles between gas stops) and it seems like nothing around town. hope this helps...........joe
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1992 Jeep Cherokee 4.0 AUTO
1972 C10 350/350
1971 C1500 350/350
1970 C20 396/400
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