Thats cool.
E39 M5's will easily do 180 mph deristricted, and often "blow" their limiter a tad at upto 165mph, M3's did the same thing !!!
Friend of mine had a 600ti years ago and that was a weapon. In fact another friend had a develpment car from Rover that was owned by one of the directors - an 800 turbo with the newer (T16 I think ??) lump in that had loads of warnings in the manual and the glovebox/fusebox telling people to not try diagnising faults and take it direct to Rover only !!!
That was fairly quick too for a big car.
Best of luck withyour plans next year.
J.
