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  1. Chevy Silverado Forum (GMC Sierra)
    So I have a 2005 5.3l with the L33, it has 64k and i have lifted it and for performance upgrades it has a cold air intake and a 3 inch mbrp exhaust with a diablo tune. Now I want to do more mods but I want to keep it safe bc its literally in mint condition and I dont want to ruin it. Any...
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