I am planning on changing my degree key but I have a Big Gun Over Rev CDI box. Do I need to get the 4 degree key, the 6 degree key or get the 6 degree and take the aftermarket CDI off. This is for my KFX, and I dont know what would happen if the timing was already advanced some with the rev box.

 

I saw Fundy say on another forum that he was making the most HP with a 38 degree advance, an aftermarket CDI and a 4-degree key should put you right in that range.