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Borla improves gas mileage.
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11-29-2006, 04:42 PM
Humdingah
Hummer Professional
Join Date: Jul 2005
Posts: 407
Re: Borla improves gas mileage.
No way a cat-back picked up 3.1 mpg unless you suddenly started driving downhill all the time or you also fixed dragging brakes while you were installing the cat-back.
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