No - legally, you cannot reproduce a named car in digital form. That's why so many driving games don't use proper names for the 'strangely similar' cars they have. It's also why Gran Turismo DOES have the proper names - and you'll never see a single scratch on any of the cars in that game. Also, you might want to watch out that theyve copywrited the SILLOUETTES (sp) of certain cars (some Porches, if I remember) as well - so even just chaning the name is sometimes not enough.
It's the same with guns. They're copyrighted. Change the name, and change the look, and you're safe. One day, Kalashnikov is going to sue the world, I just know it
However - if you want to go ahead, and do it anyway, well - its your choice. You take the risk. Just know it's not legal to begin with.