It's interesting to look at how the series has evolved to something almost unrecognizable. Much like how early 911 race cars were originally very close to their road-going counterparts, but eventually evolved into the 935.
Road-going 1989 M-B 190 homologation car:
DTM version of same car:
Road-going 1987 M3 homologation car (mine!

) :
DTM version of same car:
Current Audi A4 road car:
DTM version of same car

... not that there's anything wrong with that