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  1. check engine light on for performance exhaust valve P121B

    Dodge Challenger Scat Pack Forum
    Hello, I am posting this thread in homes someone else has gone through this issue as I am going through now. I had a Corsa Exhaust cat-back system installed on my 2016 Challenger Scat Pack. The system itself was advertised as a bolt on install with no welding required. After installing from...