The only proper paint job for a BMW race car.
There have been a number of classic motorsports liveries over the years, but for BMW there is only one, that of the 1975 3.0 CSL IMSA car. There have been quite a few times when elements of this livery were used on other things, but BMW has just announced that the livery will be copied on two Z4 GTLM cars that will be racing at the 12 Hours of Sebring. Some pictures were released of the old car on the track next to the new one, and the livery is incredibly close.
That is, the livery is as close as the differently shaped bodywork will allow. The original car was nicknamed the "Batmobile" because of its rather extreme bodywork. It was built by BMW North America for racing, and 167 homologation specials were also built, cars which are incredibly valuable these days. The car made 440 horsepower from a naturally aspirated 3.0-liter inline-six engine, a number that would still be quite good by today's standards. This combined with a very light 2,315lbs weight to make for a car which is now understandably a legend.