Obviously I've been looking in the wrong places! The game I'm
talking about is stunts and it's available as a remake named
ultimatestunts. The game is not finished yet, but it's very, very
promising and it's already very playable.
"Best game ever
The reason I think this is the best racing game ever, is not based
on stunning graphics and realistic gameplay. No it's based on what
games where intended for: the entertainment factor. Stunts was such
a great game because of the fun and addictive game-play and the
in-game level editor. And the most important thing about it: the
complete lack of realism."