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What would this tune do for a car that already has the GMPP tune?
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08 GXP Brazen, Premium Package, Air, 18" Chrome Wheels, Monsoon, Rear Spoiler, Sport Metalic Pedals, Color Matched Splash Guards, Color Matched Brake Calipers, Blinker Mod, Dejon CAI, Stubby antenna,GMPP Kit 04/13/09.
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