I have a 2013 Honda 450r and had a power up kit installed at the dealer. Since it now has an open air box and they were specific to tell me to make sure it is properly maintained I wanted to buy a couple extra air filters. Here is the thing … the cage has been changed and the air filter is much bigger now and for whatever reason nobody can tell me which one I need. The installing dealer cannot tell me … HRC has been unable to tell me and Honda itself at this point does not know and are "Investigating". I just though someone on here might know. The dealer has ordered several for me and they have all been the wrong size … either way too small or the cage is too big. This is a real shame as this kit aside for this issue is awesome and provided great results.