Heheh.. I have nothing against the '79 Camaro. It's just that, the first video you posted showed basically NO body roll. Even with shit tires, and a stiff suspension, the body will be leaning in the corners, its physics
It was more of a question towards the game physics engine as it made it look a bit cheesy, and not how you would expect a driving should be by today's standards.
BTW, have you tried the new GT5 370z Time Trial Demo up on PSN? Seems they got their grip algorithms figured out.. the transition from under to oversteer, tarmac vs. grass, are much more realistic.