Thread: Bad gas mileage with new exhaust on SS LS3
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Old 09-22-2010, 08:48 AM   #11
Bonanza7
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Drives: 2010, Rally Yellow, Black stripes
Join Date: Jul 2010
Location: Phoenix
Posts: 2,363
Yeah, I put Flowmasters on my 4.6 Mustang, and mileage went down right away. Just couldn't get enough of that V8 sound.
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