You should really go back and research your Car History, this time, I suggest going back farther than 1991.
The original GT-40 Mark-4 racecars were hitting 240 at the end of the Mulsanne straight at LeMans back in the late 60's, and I already posted video links to prove it, check
at 1:10. Somehow I think that Stirling Moss and the other GT-40 drivers are a far more reliable source of information than one of McLaren's advertising pamphlets.
There's a reason that LeMans added the chicanes to Mulsanne, the cars were getting too fast and the aerodynamics were getting too good. The cars were producing enough downforce to literally shred the tires at top speed so they added the chicanes to slow them down and make the racing safer. NASCAR did the same thing with the Daytona SuperBird, they were hitting 220+ back in the 70's because of their aero and power combination and nobody could keep up, so NASCAR outlawed the SuperBird.
All it takes is the right combination of aerodynamics, horsepower, and gearing.