I've done just that with the 91, spiked powermaster with some castor. Works fine. But the Wildcat seems to run a little better...at least it makes me FEEL better. With BVM stuff, I only run the wildcat. Order up a case, it goes pretty fast. Or call wildcat and find a local dealer. Call before visiting, though, because just because they stock wildcat does not mean they have jet-a.


But..5% works best for the 91. Don't know about the VX. More nitro on the 91 just leads to more blown plugs, not more power. At least that has been my experience.