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No. If you tune your car you void your powertrain warranty. There is no way to cheat the system. People have tried and failed. If you search you will see numerous threads about "just swapping the ECM" and it does NOT work. The car records in numerous places the car's mileage, and if your ECM mileage doesn't match the BCM's mileage they will know you switched your ECM. That and you have to give a dealer a VIN in order to buy an ECM.
You got to pay to play. It's simple as that.
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