Actually, we asked this question directly to R&D and here is what we got. This particular Superclutch system was extensivly tested on R&Ds FZR that was equipped with the new 90+mph kit. The engine was operating at 9.100-9.300rpm with 20 pounds of boost providing a top speed of 89-90mph constistently. If this clutch systam did not experience any sort of issues under this testing conditions then it should work fine on your tuned up Yamaha.
