I took the snorkel tube off and drilled a new hole in the side of the box below the filter for the PVC valve hose and re-stalled it. I drilled more 1" holes in the front of the box below the filter to relive the restriction at the opening of the box and added a K&N filter. When I did this I also put on a 1" throttle body spacer. Somebody made the comment that I was just looking for a way to spend money on my van. Yes, they are correct. I try and make some upgrade every year before my 2300 mile spring break road trip. This year will be no exception.