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Open Your glovebox and look inside it. Should be a list of codes on the bottom.
2006 Chevy Crew Cab k1500 6.0 4x4 4.10's, Magnaflow Muffler, Nelson Street Tune, Supermaxx Long tubes, Outlaw Intake, Intercooled Radix Supercharger, 2.8" pulley, FLT Level 5 4L70E, Vig 2600, snowmeth stg 2, 265/70/17 BFG All Terrains
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