I have the FREAK. I also have BUBS dresser dog/megaphone pipes and have rejeted. There is a huge difference in performance, with a little degradation in gas mileage. Well worth the price IMHO. I have not had the K&N filter problems falling off as some here have. I just took the plastic toolbox out and left that space open.

BA has Freak, 160mains, 44pilots, air mix3 1/2 to 4 turns, BUBS dresser dogs. Never had more fun on any bike - 2nd bike 2008 RIIIT