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Check engine light after catless primary downpipes
I had the dealership put catless primary down pipes yesterday on my M5 Competition. Next morning I had check engine light on. Took it back next day to BMW dealership. Mechanic said to get rid of the check engine light i needed a stage 2 tune. He recommended tune from DME. My question is, what if I do not want a tune? Check engine light a bad thing? Any harm to the engine, performance or anything? DME tune is $2400 stage two. That is steep. Any suggestions?
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