I used to use K&N on my Katana, and it wasn't as good as stock. From what I have heard, K&N's restrict air flow more than stock. I have Pipercross Street on my Busa, and I definitely like it better than stock. Got it from GPW here.
I run a PiperX street. I did an mod test on a local dyno here. Mapped with an OEM. Then replaced with PiperX and adjusted A/F ratio's. I lost 3 hp on the top but gained more midrange numbers with the PiperX. I also lost mpg. I won't post the dyno's so you'll just have to take my word for it. Long story and I don't want to go back there...
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