Relax guys, lots of tracks limit the batteries on indoor 1/8 cars. It's certainly not new.

The Rx8 is the clear choice for ESC, but motor wise you have a few options:

1. Go with a 3s and T8i 2700kv
2. Go 2s with a Pro4 HD 4300kv
3. Convince the local track that 4s is more efficient and simply follow the 1/8 "Lite" class rules I posted a few years back(you can Google it). Simply run 4s and limit the KV and diameter of the motors being used to reduce power, etc.