I've used the HiFlo filter on my Hayabusa. Think I got it on Amazon. Seems like a decent filter. There's a video on YouTube were a guy uses some UV dosed particulate to test the filter efficiency by how much "glow" there is in the filtered oil. If I recall, the K&N looked to be the most efficient, and the Fram and HiFlo looked about the same. I think I've also used the K&N on the Busa because the nut on the end makes it easy to install and remove, but it can also poses a risk of oil leakage (from a bad weld) and cause the rear tire to get oiled down ... NOT something you want to happen on a motorcycle.