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no you only have to buy credits once for your vin. but those credits are locked to 1 device. if for some reason you cant use the same device. then you have to buy more credits. if your going to do a email tune you have to buy the device with credits. the tuner can then send you the file. you only need credits to load the tune to the car the 1st time per device. not to write the tune.
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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