Interesting stuff. For 2 peak hp and rideability improvements across the whole RPM range, this sounds like a worthwhile mod.
Worst case, I can't imagine the throttle plates being too expensive if you drilled them and then wanted to go back to stock.
Just had a thought--why would drilling holes in the STVs affect peak power? The STVs ought to be completely open that high in the RPM range, and since only the edges of the STVs would be in the airstream, the holes in the flat face would seem to have no effect. Any ideas?
--'08 1125R, '06 Daytona 675, '91 CBR600F2, '03 DR-Z400E