I'm a new M3 SR+ owner and very interested in seeing what you've done to upgrade your stock audio. The only thread I can see is the massive Hansshow thread. This is the thread to show us pictures, what you learned and what you would have done differently.
Myself, I ordered the Tesla Offer harness and bought the Alpine KTP-445U amp to power the tweeters and headliner speakers. Also looking to add a sub at the back but not sure which one. New to car audio but not electricity. I've added some images I've saved but apologize for not providing credit to the rightful owners.
Myself, I ordered the Tesla Offer harness and bought the Alpine KTP-445U amp to power the tweeters and headliner speakers. Also looking to add a sub at the back but not sure which one. New to car audio but not electricity. I've added some images I've saved but apologize for not providing credit to the rightful owners.