An m3 4 door still has a tiny back seat even compared to the A4. BTDT. Front seats are not much better. Of course I am 6'5 and 250 lbs so space is at a premium. I also noticed poor quality of components in the M3's I have ridden in and drove. Except of course for the luxury package. Pat In Pat, contrast and compare an M3 4 DOOR to an A4 four door. Might help you make my point.