I believe 'em. I've done the same stupid thing myself. My car's been 150+mph several times and one time I hit 170. Gotta love the extra gear. As it is now with the 3.73's and viper spec t56 at 100mph the engine spins at about 2400rpms. And yes, there will be a limit where aero drag, gear ratio, and engine power will hit a wall, unfortunatly for lots of us our cars will do a back flip before we get to that level.
Going that fast with our cars aerodynamics is scary, my car in particular sets down and tracks straight at 100mph, but going 35-?mph over that the front end gets loose and on bumps/highway overpasses the rear tires lift off the ground.
All I want to say to everyone out there thinking about going as fast as your car will take you please do not do it with anyone else on the highway and especially with anyone in the passanger seat. If your going to be stupid, dont take anyone with you. Also while you are at high speed you can not make any sudden movements, keep the wheel straight at all costs, use all the road available and make sure your tires/suspension/rear end are up for it.
fawcett