Its a nice site. I like that Camaro in the header. If you're going for a more professional aprroach, however, I would advise you to get rid of it. I'm not a big fan of grey, but that's just personal choice. Nice site, again.
Nah. I think that what I was trying to say is that pro sites --stores -- don't often have images of specific items on the header. They often have a logo, and then show their services on the body. Look at Walmart, Ebay, Amazon, Target...well, almost all stores. No specific images on top.
I personally would try to look at taming the logo a bit. It comes across very very bright.
Next - the background to the right of the car does not match up with the background used in most of the header.
Thirdly, you might want to try putting an image of a car opened up in different views to showcase some of the products you have on your site. It would be tight for example to show a door opened to a inside loaded with gadgets and light candy. Just my thoughts.