I'm stuck on Carbon 92% too. I need to get rid of Wolf in that Canyon Race where he has that Gallardo, and three race wars and the Final Boss race. With an SLR it is easy to race in the City Streets, but in the Canyon, it makes no difference what you speed is, it all about control.
I re-installed Underground 2. I decided to play it again.
I also have Underground - but a friend of mine lost the 2nd CD T_T So I need to either buy it again (Pirated, of course) or download the game.
Otherwise, I've played NFS II - SE, NFS Porsche (which I am stuck on, again), and NFS: Hot Pursuit <- I need to pla Hot Pursuit again.
But I have played Underground and Underground 2 nearly 10 times each. I think I know the city in Underground 2 at the back of my hand XD