Will an aftermarket exhaust really make a difference in fuel mileage. I have a superchip programmer and an air raid cold air intake on my 09 rubicon unlimited. I have a borla on my yj and I love the sound it makes but on the newer jeep it would be more for fuel mileage gain and performance.
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Short answer yes, but do you really drive the Jeep far enough to make a difference.
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I am here: http://maps.google.com/maps?ll=39.040556,-94.260859
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We've done a couple of the first gen JKs as far as the performance mods go and I have to say I wasn't impressed. One client brought a brand new 2009 to the shop and asked that it be outfitted with intake, headers, and full exhaust along with a programmer.....for the substantial amount of coin he spent, he gained 11 hp......To me, that was not a cost effective hp increase. And, to be honest, he never claimed any noticeable fuel mileage gain....
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