In the case of the new 10
Kawi had to de-tune the bike because of epa reg.
the zx-10 made too much intake sound (noise) at higher rpm,
so the bike had to be de-tuned.
And it still put out plenty of power to contend as a liter bike leader
Let's not forget about it's "best electronics" system available yet on a liter bike,
even better than bmw