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I have a 330i (NL) from 12/2019 and had no pops & burbles from the beginning. The dealer told me it would come later. Now 5000km later I still don’t have it. So the learning part is indeed BS.
Software versions after 09/2019 don’t have the pops & burbles anymore.
This can be undone by a modification in the ECU, changing the ECU is like a chiptune.
How did you made the exhaust mod? Also by modify the ECU?
Modify a setting in the ECU will void the warranty here in NL. But if you already did this, I would modify it again 😉.
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