Guys, are you aware that top torque of the original bike is at 5100 RPM?
Modified one gives you that same torque at 3500 RPM!
Modified bike at 6500 RPM still gives the max torque that original bike had at 5100 RPM!
That is simply AWESOME.
It transforms the bike from good to awesome, if you actually like to ride it and are not afraid to use the full RPM range
Ah, and if you ride it like granny, you still get the benefit of having max torque at low 3500 RPM, which actually does not fall off afterwards but keeps rising (unlike the original after 5100 RPM).
P.S.
You do not do this kind of mod to get "3 HP on top."
You do it to get more useful torque all over the RPM range and actually keep the motor more relaxed.