Wow, a stock car for people who want to race Charlotte or Talladega but can't. Wow. Impressed. Anyhow...
I didn't know there is actually a one-off of the BMW M3 GTR. As the E3 pictures have shown, that same GTR road racer in EliseRacer's post will perhaps be in GT4. I've known the Prototype Technology Group (PTG) BMW a little longer than this one in EliseRacer's picture. It packed about 444 horsepower and took the fight to Alex Job and D. Barbour. Now that Porsche is now facing Ferrari and Morgan, nice to see this BMW M3 GTR again after a long while. The Porsche 911 GT1 is a nice one-off in my view. It may not be the 956, but it is a modern dream car that hasn't seen much action since their Le Mans win in 1998. Never heard of any factory efforts from Porsche to take the fight to the sportscars. But the 911 GT1 is perhaps the only Porsche that doesn't look Porsche. I mean, it's not really a stretched 911. It's alluring, unmistakable, and I think it's one of the coolest GT1 race cars of the late 1990s other than the Mercedes-Benz CLK-GTR, Panoz Esperante GT1, and of course the Toyota GT-One.
It would be nice to see some one-off Toyota Supras from the GT500 class. While there are many aftermarket parts that, when the right combination is found, looks more like a streetcar version of the GT500 track monsters. For fanb... lovers of the Nissan Skyline, a GT500 Skyline one-off isn't bad at all. They'd have to come with modified versions of the engines, though. And oh yes, if they wanted to, the one-offs would come with 500-600 hp motors to scare off muscle cars or European exotics. But if they did that, they'd have to drop the weight a little more. I'm thinking of maybe an unreal 2300 or 2200 pound race cars. Maybe something along the lines of the Corvette C5-R's weight. Even then, a C5-R one-off would be cool as well. The C6's styling could have been based on the C5-R, but did Chevy think about this? No. It MAY kill the next Corvette in terms of styling. Other than that, look to GT/sportscar for some nice one-offs.
Let me end with a VERY strange idea: a one-off of the Audi R8 with a closed top. Any more one-offs you want to talk about?