I'm replacing my original air filter on my F4I with a K&N. How do you get the old filter out of the housing? Do you use the housing or do you discard it? I would think that you would have to keep the housing because of the fins that direct the airflow into the throttle body.

 

I when i replaced my filter, i just discared the old air filter, and directly placed the k&n in. I did not use anything from the old air fiter, the housing would not fit over the k&n.

 

I just found out that the filter is under the gas tank. How hard is it to get to it and how hard is it to change out. I would just like to know what I am looking at before I start surgery.

 

dude not hard what so ever, all you need to watch out for is there is a little hose on the right side of the fuel tank that will become disconnected when you lift the fuel tank, just remove your rear brake reservoir so you can get your hand up in there to reconnect it, other then that all the plastic you need to romove is a walk in the park. to put in short , a trained monkey can handle it.