[grumpyunk]

In theory, the K&N and the pod are less restrictive to airflow. That is good and it is bad. Good for more power, more fuel usage per mile, but bad in that they reduce restriction by being less effective filters. They will pass more particulates. The problem of over or under-oiling the media is also very common. Too much and you restrict airflow, too little and you let too much dirt into the engine. Question becomes is it worth the aggravation and possible damage from dirt particles? Your choice.
The increase in airflow may require a larger jet. It depends on your location and altitude you ride at. You may want to do your thing with the filter of choice, and install a new spark plug at the same time. Ride for a bit, doing normal things, and then pull the plug and examine it for color and deposits. A lean engine will generally leave the plug very clean. A normal will leave slight deposits, likely tan in color. An over rich engine will leave black sooty deposits.
tom