Vote up Reasons why would be great too!My e90 just hit 100k, got a new baby on the way and that was my promise mark to stop holding back and go nuts with this one. 3[20]i though. I'm wondering about the ECU at the moment. What do you guys suggest? I've heard issues with the ECU and how it handles retrofitting and it's very demotivating. What do you guys think? Any experiences?Car is as of this moment, absolutely stock ~Vanilla Stock.