Originally Posted by Roelof

People fear of loosing the excitement of going powerful fast. I have runned many classes, even with a simple Nikko car we had a lot of fun racing all with equal low power.
Going for a hotter plug will do something but the best advise is to take out a shim, lower the head by 0.05 or 0.1mm because with the smaller combustion room a less power combustion will bring back some power compared with no compression change.