Originally Posted by tszene
the stock 19'' had the Michelin stock tires.
OK. That explains it. You can build much more speed on the fast straights since your exit speeds will be so much higher.
I decided not to go back to the Glen in my E92 M3. I can't restrain myself to go slow once I am on the track and that track is too fast for an uncaged car with 400hp IMO. My speedo was hitting 150+ as well. If something goes seriously wrong at those speeds in a street car, I don't know that you have much of a chance. Be safe.