I was wondering... Do you make your cars using reference pictures set up on planes? The up, sides, front and back views? If yes, would it be possible for you to post the max file with a sample set-up? I'd very much like to see how you do it. I'm trying to make a car too, but there is something wrong with my set-up. I can't make all the planes to be aligned perfectly, one is always off and it screws up the whole modelling - when I manage to align polys in two views, they are always incorrect in third one. I have no idea why, is it because I place the planes incorrectly or due to bad scale of refference photos.
I have to agree with aspirin111, the rear rims are more (I think it's named) "concave" on most of the Lambo cars. If You check the Aventador out, you can see that too, even if it's not as much as other models.