3.8L performance tuning help!! - Page 2 - JeepForum.com
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post #16 of 17 Old 01-16-2013, 02:22 PM
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2010 JK Wrangler 
Join Date: Dec 2012
Location: OKC
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Supercharge the thing and get it over with.

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post #17 of 17 Old 07-26-2015, 11:28 AM
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2008 JK Wrangler 
Join Date: Jul 2015
Location: Oklahoma City
Posts: 2
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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