Gosh... some of you look for any way to get a cheap laugh. It's like that thread where someone posted about the "Best in Show" winner and talking about what would happen if the winner in class was a Porsche or Ferrari.
On a serious side (more serious to some of you), could this happen? There are a few ways PD will go around it. The first one is obvious- replace the XBOX360 decals with either Sony, PS2 (maybe even PS3), or a Gran Turismo logo. The second option is to simply not include the car. However, there would be a problem if you're wanting to include all Super GT champions until the next build of GT. I think it's also obvious that the Sony/Microsoft rivalry has been around since the PS2 and XBOX gained momentum in the gaming market. I guess the premise for some people is "what if a race car with the livery of another game company or another console (even if it was a rival) was in a Sony-made game?" It is very likely the sponsor may end up on the car as advertised. Someone said it would be funny if Suzuka was included in the next GT with a big "XBOX" banner across the track. It's basically a sponsorship deal. Should have nothing to do with another console maker's sponsorship in a game by another manufactuer over a certain developer.
By the way, I like both Vipers you mentioned Vipfreak. I like the Benihana one better, though.