Yep, had them on two of my ZZR1100's.
Both C models, both with 4-1 microns and both with K&N, they were like chalk and cheese ........... go figure.
One of them was grumbly under 3000, the other pulled like a train all the way from 1500, but the grumbly one once it was over 7000 really went like stink compared to the other one.
So that helps you loads doesn't it