Your ECU tune may soon hold you up in California’s smog test

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Magnaflow xMOD cat-back exhaust system for the 2020 Toyota SupraFrom July 19, 2021, California will start testing for non-approved ECU tunes during its biennial Smog Check program. First spotted by Car Bibles (via Road & Track), the rules state that any software not provided by the car’s manufacturer or approved through a California Air Resources Board executive order will fail the test. Details of the…