Some of you old school pc people may remember Stunts... Well, I found the modern version!
Trackmania Sunrise
If you are looking for a realistic racing game with great physics... Skip this... BUT... If you want to do wild and crazy stunts at insane speeds, go get the demo.
It has several gameplay modes and a great track editor. So, if you remember and liked stunts, go get the demo!
Here is a review I found.
http://www.gamershell.com/pc/trackmania_sunrise/review.html