Great review, I also went over and looked at the thread on bimmerpost to see the reactions (didn't get all the way through though), then wondered about lap times:
94. BMW M3 CSL 7:50.00 158 '03 360 / 1385 Horst von Saurma
101. BMW M4 7:52.00 157 '14 431 / 1497 Horst von Saurma
11 years apart but the same driver.....
still pretty impressive!
source:
http://fastestlaps.com/tracks/nordschleife.html