Regarding filter elements for our air cleaners, we have 4 main families of Outlaw HiFlow Air Cleaners-

425
587
606
636v

The 425 had only one filter element available

The 587 has Two Different filter elements that fit. It comes with the K&N, but you can get a Synthetic for it also.

The 606 has three different elements that fit, the 0800, the 0818, and a modified 0818. When ordering a 606 we ask what bike it is going on and send the appropriate filter element.

The 636v has 5 choices of filter elements, 4 K&N's and 1 DryFlow synthetic. When ordering, there is a choice of which element you want to use with the A/C.