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Your tune will over write the stock file. Your going to have to update the tune you have now. We did mine Friday night and it took all of 5 minutes to do. If your updating the tire size, measure the height of the tire installed on the vehicle with weight on the tire. DO NOT use the tire height published on line. A good example of this is the stock SS tire size is listed at 28.7, but in the stock tune file, it is listed as 27.79.
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ProCharger P1X, Vengeance Racing Kaotic Cam, ARH Headers and Exhaust with Borla ATAK mufflers, MGW Shifter, MTI Drop Springs, Forgeline RB3C Wheels, 3.91 gears, Night Owl LED Control System
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