I was just addressing that someone brought up the M3 CSL's 7'58 or so Ring time, personally, I love BMW's to death, I own an old one matter of fact, but you are right, they are aiming at different goals...but, uh...there hasn't been an M3 Sedan in the E46 Generation last I checked...if there has, it's been kept a good secret in the states...the M3 and M3 CSL out now are Coupes, and arguably sports cars, with grand touring aspirations.
I keep hearing that the 7'59 time was for a C6 Z51, that the 7'43 was for a C6 Z06, and that there are no running blue devil prototypes that they would even reveal in public, much less admit too.
They have said directly though that the Z06 was the blue car that did the 7'43.
The Author of that one article was just stating stuff he had picked up other places, true, and as for the "only one production car has ran better than a 7'40" can you blame him really?
The Carrera GT's time is well known...what other cars can you think of that have gotten close too it?