[campbellcj]

I'm not quite as big as you guys but I know that in general, some pretty large dudes can and do fit in these cars.

You can put a smaller (e.g. Momo) steering wheel on the car to get a lot of extra knee room. You also may want to find a car without the center console. The consoles are cool, but they cut into knee & foot room a lot.

The other issue I hear about a lot is headroom with a helmet on, for track events. Most track driving organizations want you to run with the roof on, and that just does not leave much headroom for taller folks when you factor in the helmet. Removing the bottom seat cushion is about all you can do to help there.