Was starting to think this was a troll. But not the case.
From your purchase post - I think you're not going to be as in love with an OEM xpipe and exhaust. Probably would've been worth riding along in an unmodified car before losing all this money and time. Might be right back where you started after 6 months...
"Hi All,
I have been on-again-off-again thinking of buying a 2013 M3 for the last 2 years based on a recommendation and research.
Long story short, I just bought one today. Once I drove it, I was in love. OMG
I have a lot to learn about it and get to know it and totally looking forward to it.
I did get a PPI done and they said it looked clean. sooner than later, rear brakes, oil....
Any tips/advice welcome!!
Cheers"