Modding = modifying = adding modifications.TH3RM4L link said:
Depends on the anti-cheat as well as server options;
If AC detects you putting rims, NOS n stuff on your car - ban, and if it doesn't - you're golden, HOWEVER, if server (gamemode script) doesn't have some of those modifications (rims, NOS, spoilers, etc.) and admins see you have them, they will know you used a hack - ban.
You can TRY to disable vehicle information, that may or may not work, depending on server, however, in most cases they won't see those modifications...
Your best is to make a fake account - try and see. Or you can give the IP to us and we can test it out, perhaps.