I'd like to understand difference between 320i and 330i engines as well.
I test drove 320i with engine B48D and I own 320iX with engine B48C. B48C doesn't have exhaust flap and has software without pops and burbles, see here:
https://g20.bimmerpost.com/forums/sh...php?p=26090135
Can 330i owner hit the gas and take picture of Sport display please ? I am interested in maximum turbo boost pressure. Mine seems not be able to reach even 1 bar. I have MST Cold Air Intake. Unfortunately no measurement with stock intake.
Upgrade from 320i to 330i costs 10 000€ in Finland while in the rest of Europe it is around 3 000€. I find it not fair and that's why 320i was my choice.