In order to remove the K&N filter, you'll need to either take off the front bumper or take off the right front wheel and loose the inner fender to get to the CAI.

Dinan sells a replacement K&N filter which you can get at K&N distributor for aroung $28. Howver, there's no need to change the filter, you just have to clean and oil the filter then it get dusty. Here is what you have to do:

1. Take off the K&N Filter
2. Rinse with water and brush the dust and particals.
3. When the filter is clean and dry. Apply the oil. Make sure to hence the red color to the filter.
4. set it for a while and you can put the filter back on the CAI tube.

Hope this helps!

Regards,
JIMMY