I changed changed stock manifolds to headers, spectra cold air intake and banks monster cat back exhaust. Great low end power gained gas mileage until I installed cat back. Lost 2.5 miles to the gallon on highway. It averages 13 miles to the gallon on highway but picks up.3 to .5 mpg in the city. Stock gears and 30 ' on 2008 unlimited. Just baffled that I lost gas mileage.
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