My 08 called for the air filter to be replaced at 12K and my 2012 calls for the replacement at 11250. I have been waiting for the after market folks to make one for my 2012, has not happened yet. My 08 has a K&N and I clean it every 3.5K. Went to Chaparral and picked up the OEM filter for $41.43. Put it in the day it arrived. Bike had 11,996 on it and the original filter didn't look too dirty. Took a soft brush to it and a whole bunch of bug crap came out of it and I banged it down on a flat surface and was really surprised to see the amount of stuff that was in there. My first trip with the new filter was a real eye opener. It wasn't a situation where I thought it was a bit better. It was a situation where I thought, HOLLY CRAP, WHAT A DIFFERENCE! IT WAS THAT PRONOUNCED. I just ride on hard roads, no dirt. I am going to be pulling OEM filters at 6K miles.