[EricH]

Yeah... you can modify the FP gearbox, as it isn't integral.

However, it might not be worth it. The FP goes 15000 RPM free speed (give or take a few hundred or so), and I'm trying to remember what that gearbox takes it down to. If it's close to the gearbox number, use a sprocket or two; otherwise, use a different gearbox.