Hi, I had the same problem on my 2014 228, from my understanding the dealer will tell you to replace the muffler. At least they did for my nonMPE exhaust. I know you can also do a valve delete but I don't know the process for it, if out of warranty it is a much cheaper option.
I had one dealership say it was covered under CPO due to it making a noise, while the other dealer did not believe it should be covered under CPO. I would call around and ask if you want to go the dealer route. I think it is a pretty common problem.
I see you pretty much already came to this conclusion but just wanted to share my experience as well. Good luck!
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