Currently, it seems that only Nissan's Nismo is still showing a lot of support for performance cars. They are still doing new demo cars using Skyline GT-R. I think their latest demo car is a BCNR33 Skyline GT-R. The motorsport division of other manufacturers seems to be sitting quite idly nowadays...
ZTH got a lot of rich sifu. But most of them not active now. I remember there is this GT-R sifu here who owns a few Skyline GT-R himself.
The last one would be the Super VR-4 EC5A with 6A13TT. I think should be 20 years ago already.
The latest GTR R35 got Nismo version ma, the one that did 7:08 in the Nur.
6A13TT VR4 was released until 2003, so almost 15 yrs ago.