While I have to admit that I'm not much of a car buff, I do think that Drag Racer 3 is a pretty cool flash game.  In this game you get to buy real every day cars like Hondas, Toyotas, and Nissans, as well as top end cars like Ferraris and Lamborghini's.  Then you get to deck them out with all kinds of custom upgrades and take them out on the track to race. It's a really awesome concept and it works great.  If you like cars at all, you'll love this flash game!

Controls:

Space Bar - Gas

Up Arrow - Shift Gears