Look up M3 rotors it says right in TIS do not machine M rotors, weird huh I never rec machine any BMW rotors, I used two and have changed my mind after years of real world results with turning BMW rotors. Do a search on a thread where me and Alex323i had this discussion
Service Manager/BMW Tech
JB Eurotech Service "Your Reasonable Dealer Alternative"
General Questions can be sent to email@example.com
1. Do not argue with an idiot. He will drag you down to his level and beat you with experience.
2. Light travels faster than sound. This is why some people appear bright until you hear them speak.