nice project, tested it with 2 friends. Movement and Camera needs adjustment. When you drive at max speed your are drifiting like crazy. The racing track has no borders. HP bars needs to be hidden, camera when jumping is going through the cliff.
Suggestion:
1. time playing this map I had no clue what to do (although I was the host), because I missed the -start message. Adding some tutorial could help.
2. Adding a button for brake
3. adding some custom frame with showing the race track with your position maybe?