Thread: 08 Silverrado 5.3
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Old 04-15-2009, 03:57 PM   #5
BigdaddyDupree
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contact justin at blackbear performance and get it tuned for mileage. my tahoe has a tune. cai. exhaust. and gears and with a 350 with 35s and 20s i get 16.6 average
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