Back when I first got into these cars I had the same problem. Me and a couple of guys would get together on weekends and race, drink and have alotta fun. It was better than cards. Unfortunatly I started with the dual cells and the pcb swaps and ordering high rpm motors off the net and started whooping them. They wanted faster cars too so they started to dual cell and buy faster motors. By the end we had 3 seprate classes. We had a stock car, modified and super modified.
Unfortunatly they lost interest one by one and are to damn lasy to continue modding so Now I'm left with noone to race wit
I personally say anything goes.