So for those looking for technical data on the new B46TU and B48TU engines. According to that .pdf, the engine in G20 is supposedly B46TU, not B48TU, but I thought B46TU was for American models only where the rest of the world has the B48TU? Anyhow, the summary of upgrades and differences between B46/48TU and B46/48 is very descriptively explained in this pdf guide.
https://f30.bimmerpost.com/forums/at...9&d=1553708460