Got a Uni filter, put it on today and have a question. I had a K&N filter on there first so I took that off and slapped the Uni with cage on. When I tightened it down the front of the filter was still up in the air a bit. I didn't really take a good look but is there a "base" or something that needs to come off from the K&N before I put the Uni on or something else i'm missing?