they came with their own special hub caps!
My 318iswas cracked on the manifold on no1 and 4 and on the flange which connects to the downpipes. Although it never ticked it was blowing a touch. My uncle welded mine
They weren't basic, free metallic paint was an option (not many took it!)
E/w E/s E/m, m-tech s wheel + nob, cloth sports seats, m-tech suspension + brakes from 325i sport. Se rear spoiler. colour coded mirrors and bumpers, plus the all important M42 16v screamer! Some have catalytic converters like mine did
options included M-tech 2 kit,obc's, lsd 4.10, abs, bbs 14+15, iS lip spoiler front , head lamp wash wipe, leather, rear blind, front fogs etc
TBH not many came with alot more than alloys most are red and white
HTH no car came with M badges these are added by people afterwards like ME!