Actually theme design is bad, only you need more visual elements releated with cars such as a nice header image.
The general information about cars is not in good quantity. The information should be added regularly and updated daily. More photos of cars to be added.
Background is nice, but the whole page might be to colorful and it loses it's focus. If I were you I will dim down the background color. Good luck.
In my opinion you have way to many image logos in the design. I think it's very distracting having the images on each side of the blog and agree you should think about creating a nice unique design for your header.
when i try to put in the custom header i made it drops down like 4 lines and looks all screwed up.. it's just a template and i don't know how to fix the HTML part.
You should probably change the background. The idea behind was nice but page is so long and there are too many different colors all together so it looks odd when scrolling.