That csl is damn funky, and I've always been a fan of the BMW M1... There was speculation that it would be included (I'll be lynched for this, I can tell...) a while back following a test session that PD did to record car sounds etc. A picture showed a "wedge" that people were struggling to identify...
Can't remember what it was decided to be...
oh well... but yeah, great additions (except the 80's M3, by then racing cars had lost a lot of originality, so the BM would race much like the Merc 190... *yawn*)