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Borla improves gas mileage.
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11-29-2006, 11:39 PM
f5fstop
Hummer Guru
Join Date: Jul 2005
Location: Idaho
Posts: 4,744
Re: Borla improves gas mileage.
I would say
, but that is not nice.
Only way you would get that improvement is if your stock muffler was heavily blocked.
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