Thread: Post your engine performance mods and HP/MPG gains!!!
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Old 09-11-2016, 03:06 PM   #10
waco
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Join Date: Aug 2011
Location: tuolumne,CA
Posts: 74
Re: Post your engine performance mods and HP/MPG gains!!!
2003 Tahoe 4x4, 4.8l auto trans
Cat back & free flow intake
Added 3 mpg & a little better seat of the pants feel
Andy
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