You guys notice the hiss coming from the either the Berk HFC/Berk CBE combo or from the Berk HFC/Gemini CBE combo? It's definitely there as the rpms drop. Kinda annoying, if you ask me. Trying to avoid that at all costs.
Might have to go with HKS after all: According to him, no rasp/drone/hiss at all with this combination.
Berk HFC's and HKS Hi-Power CBE