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That reminds me of an issue my wife used to have with the exhaust on her M3. She had an aftermarket exhaust on it and very often she had the 'check engine' message on. The dealer did not do anything because it voided the warranty and the only option was to get some kind of chip apparently. Now, funny thing happened, she actually received a message from BMW NA about a recall on her old M3 several months after she traded it in, related to that check engine message. Seems that, in the end, the message was not there because of the exhaust but because of some failure of the car itself lol
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