@NekuSakuraba: I am not very interested in normal road cars, I have much more interest in modified race cars, or prototype race cars. When I say modified I don't mean a "sick" Chrysler Neon with 19 inch rims, I'm talking something like this..
Something that pushes technology using the given resources to the limit. There are so many massive differences between the road version of these cars and the GT2 version you see above.
Regarding the cars you see on the road, I find them interesting but I'm not obsessed. People who know everything about every little detail of hundreds of cars honestly scare me. I can identify cars, but I couldn't tell you all of the different engines you could buy with it or anything like that.
I just played the demo, I have a low end gaming pc (9800GT, 2.8GHz AMD dual core) but it never dipped below 30 fps on 1680x1050 and it looks great. If you could play Bad Company 2, you will play this just fine.