This is an interesting one, taken a 3.3 M30 engine from a 633csi, reconditioned head (with light porting), and an engine management system from a 1988 535i so the year and wiring should be the same. We have never done an automatic in a conversion before nor a M30 3.3 into a E30 4 door.

To complete this transformation we also did a 5 stud conversion to upgrade brakes and wheel options. Exhaust system is a twin 50mm stainless with twin metallic cats though to twin resonators and onto a twin in/out stainless steel box. Throaty but not droning.

This is a highly recommended conversion by us as it is the most value for money conversion to an e30 to date.