First of all, my Hoonicorn have invisible wheels. Some availible car designs don’t have problem with that, other do. Maybe it’s caused by some colour problems.
Also, I noticed quite big lags and stuttering while I’m in menu, the biggest was when I was switching between wheels. (Game is installed on SSD)
Durnig first 4 hours of play game crashed twice in Forza Cup after the race(in menu where you can save reply, go to next race or repeat the same).