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Quick update:
I removed the value spring last week and it helped a bit, especially since I mostly drive in comfort mode. Much louder cold start and more pronounced pops.
Today I removed the resonator and I couldn't believe the difference. The cold start and the pops and crackles are just as loud as my F80 ZCP. My mechanic drove it down the street for me to hear it and it definitely sounds better than my M3. Not quite as loud, but deeper more exotic sounding. I'm very pleased with it, for now...;-)
I'll try to make a video tomorrow.
Thank you all for your suggestions and help here.
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2013 e92 M3
2011 X5 35d
2018 F80 M3 ZCP
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