Note that contrary to common impression plugin Acid_house22 mentioned is
not just VR and Official CC plugin for GTR2. It adds bunch of things original game did not have (mostly silly tricks to deepen the simulation). But even if you are content with GTR2 as is, it does the following things:
* fixes texture/headlight flickering
* fixes backfires on all cars
* adds triple screen/ultrawide UI
* full CC integration, much richer than rFactor plugin model.
* wires a special version of DXVK (DX9 to Vulkan) which leads to better framerate on newest hardware, especially in VR.
To see what else is available, check out Table of Contents in the manual. All the new features are integrated with CC. For example, if you flat spot your tire, Chief will tell you etc.
And much more is in the works. One big thing for this year is to improve memory usage, if it works out we'll be able to use 4k textures and larger grids.
If you want to try it, HQ Anniversary includes the needed GTR2.exe, you can then decide whether to buy Steam version or not
Also, HQ Anniversary contains dozens of enhanced cars that utilize features of that plugin, such as button controllable wipers (that includes working rain wipers in all P&G cars!) and richer motec dash data pages.
A bit of demos:
More mature VR and working wipers (see 7:12):
Also, some more improvements - Spin/Lock indicators, additional Motec LEDs and Triple screen UI and backfires fix: