I watched it and I bought a Lexus IS F and RMed it....thought it was pretty cool...
Didn't like the car that much to drive though, 8 gears boggles my mind...
Its not really a very "high" level. The car I think aside from the aero bits and uprated suspension its mostly stock. The racing fuel cell and whatnot will have different plumbing into the stock fuel system. And those can get incredibly finicky if you don't get to test a lot. Which I'd imagine they don't really since most of them have a day job....
The Ring 24 is like a mixed bag of very high level racing cars and really s*itboxes running around the track. And they are somewhere in the middle...