yeah, the rules are pretty relaxed - you don't need a kyosho body at all. The difference between S and R are engines. The standard GS15 or GX15 engines are for the S class, but the R class is for any engine (up to .12 I think). The S and the R class will run together though.


Here's the link for the circuit, I've never been there though.
http://www.cotswoldmodelcarclub.co.uk/