So close to changing the whole model

okay, i was gonna give up on modeling the Skyline. I had a minor problem with it. rendering side of it. it comes up in two different shades. let me show you.


But thanks to Ferhan, he figured it out and solved it for me. he said it was the faces. i got it laying over another. but i didn't know how to get into. he said he just deleted the top faces. what a simple problem that i forgot about. but now solved. otherwise i would of started again with an easier to model car. Audi TT =D