One in boot, 3 in back seat. You will obviously want the wheels to be in bags. SUV would make it easier but it can be done with M3.
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust