Site looks pretty good. There are some things that I would change around and it needs some really good SEO done to it but otherwise pretty good.
One thing I would share with you is on the rollovers (really cool!) that show the cars, I would have the cars show to the right and not underneath.
Also, what is the space on the top and the junk on the bottom on the main page?
If you need SEO help feel free to contact me.