That is not a csl. It used to be a standard 3.0cs before this guy mutilated it. That car is more e39 M5 than e9. He modified the body of the e9 to fit the e39 subframes and suspension, iirc he had to shorten he prop shaft only a little bit. I suspect the car would be worth more if he restored it.
I don't mind what people do to their cars but e9s are getting very scarce and finding one worth saving(rust is a HUGE issue) is neigh on impossible, so this is a bit sad to me.
Regards
Jacques