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How are you planning on doing a tune? Typically the tuner would pull the tune that is currently on the car, and then read data and make adjustments. So if it's already been tuned, the tuner will be working from that tune and making adjustments to air and fuel if needed.
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LS3 Crate Engine Swap | CSP Custom Cam 232/240 .615/.615 113 +3 | Stainless Power LT Headers | Z28 Intake | Borla S-Type Exhaust | FTI Triple-Disc Billet 3200 Stall
2012 Camaro 2SS/RS | 1968 Camaro SS | 2020 Cadillac CT5 Premium Luxury | 2021 Spark LS

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