Well, no leak.
The K&N makes a nice improvement in the throttle response and boosts power just a bit. It's boosted just enough to not have to downshift going uphill when you'd normally expect to.
As for installation: the directions I got were for a Pathfinder. The filter fits anyway. Ignore the part about pulling out the tray. When you're placing the cover back on the box, you just gotta wiggle it around a bit so the edges of the cover and are flush with the bottom of the box.
mikeT