I know this has been posted before somewhere and R.Kubica shows here what it takes to do a quick lap in an M car, this one being an M4 in his hands with uprated gas suspension with KW springs, stripped out interior with roll cage, race seats, Pro Track wheels with semi slick tyres.
The key I believe at these speeds is having a vertically mounted GT3 type rear spoiler to counter the over steer leading to a spin seen so often on many RWD cars at the track.