What kind of car do you use in NFS Underground?

[Hu[M]aN]

I got NFSUG last weekend and I am at race 71 or somin.
I used to have a red Supra, yellow neon, spoiler, muffler tip ect.
then i got stuck on a race and I was always crashing and stuff so i changed the car because i thought it was the cars fault. its now a silver mitsibushi skyline with black rims, muffler tip, spoiler ect .. . i still havent won the race...