Is ECU tuning legal on a street vehicle in the U.S.? The EPA Clean Air Act is the controlling authority on whether you can alter the ECU ECU tuning, or modifying the software in the ECU to obtain better performance, is considered tampering, and is illegal throughout the U.S. Any modification to the ECU that changes the way the engine burns fuel and affects emissions, is illegal. Is doesn’t matter if your ECU tuned vehicle passes the smog test The altered VW Diesel engines passed smog too, but they were … Read More
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