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Originally Posted by bmw_m2_cali
Thanks for commenting! I was worried it was an engine issue. Rattling exhaust flap does not sound nearly as concerning/hard to fix.
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It shouldn't be a big deal. They should know exactly what it is. It happened twice on my M235i. Once on the stock exhaust and again on the M-Performance exhaust. The last M-Performance exhaust they swapped it with ended up being fine up till the time I sold the car.