There's not a lot of activity on the SAV forums...I don't think too many owners work on their own cars.
The N20 engines are used in the F30 3-Series sedans, you might want to do a bit of browsing on their forum as you'll find a lot more activity and commentary, such as here
https://f30.bimmerpost.com/forums/sh....php?t=1225865 and here
https://f30.bimmerpost.com/forums/sh....php?t=1614899
Good luck / Bill