Still no. I have about 30 mins then I'm off to sleep and will reveal it.
I said this specific car is related to Europe. It's cousin is related to Japan. But they're not produced in either region. And if you in any (as far as I know) GT game after GT3, you'll find it if you look closely at what the cousin did.
Edit: Accepted answers:
Any Team Oreca Viper. Reason:
The #51 Viper was participating at Le Mans and is thus connected to Europe. The Viper GTS-R in general was also run in Japan (STP Taisan Viper from GT2). However, if you look at any "banner" for the Japanese Championship in GT3 or later, you'll not only notice Honda NSX, Nissan Skyline and what I believe is a MR-S, but also the Team Oreca Viper, possibly as a PD reference to the Taisan Viper and so it makes sense.