The Ring isn't in outer Mongolia!
Your car will be fine, so long as you keep an eye on stuff and have some mechanical sympathy. I trust you're not going to try and set any land speed records out there? My car was bog-stock first time out there and I didn't die, drive in accordance with your ability and the car's limits.
Tyres are a tough call mind, they'll be lethal in the wet on there especially under the trees. Maybe shift them on to someone as track tyres and get some PS2s/F1 asym.
Oh, I doubt you'll be insured for the Ring either - so bare in mind the 3rd party risks.