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2007sierra

  1. Help Please

    I have two questions first does anyone know a safe way to be able to fit 285s on my sierra its the classic body style and i have my keys all the way up and it barely fits my 265s :(, and second does anyone know hoe bad my gas milege would be if i ran a y pipe straights. i have a flowmaster and get about 14 around town. also how loud is it inside the cab with a y pipe ? Thanks alot guys !
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