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I started off with a piece of 1/4" plexiglass and cut 2 pieces to match the size of the airbox. I then placed it them on the airbox and traced the filter opening and all of the bolt holes. Next I pulled the rubber adapter out of the new filter. I then placed the new Spectre filter centered on the plexi and traced the outline of the filter. Then I drew a circle 1/2" smaller than the outside of the filter. I cut everything out with a jigsaw. After that I ran the outside edge on a router to round it over. I also did the filter opening. After that I sanded the edges with 220, 400, 600, and 1000 grit sandpaper to get the router marks out.
I used a PVC end cap to fill the hole in the box.
I then took the plastic off of the backside of the plexi and painted them flat black. This will show nice and glossy through the oustide of the plexi. You can use whatever color you like to go good with your bike.
I used all stainless allen bolts from the local hardware store. These 3 need to go through the plexi before you install the filter.
NOTE disreguard these bolts. It is too much of a pain in the ass to get nuts on the back and try to fit a socket in the recess. The only bolts holding the plexi onto the box are the two outer visible bolts. They are enough to get a tight seal all around.
I used 1/4" self adhesive foam weatherstrip around the perimeter of the filter. The filter is secured to the plexi with hex head stainless sheet metal screws.
On the backside of the plexi I used 1/2" self adhesive weatherstrip.
The plug is sealed with silicone.


I used a PVC end cap to fill the hole in the box.



I then took the plastic off of the backside of the plexi and painted them flat black. This will show nice and glossy through the oustide of the plexi. You can use whatever color you like to go good with your bike.


I used all stainless allen bolts from the local hardware store. These 3 need to go through the plexi before you install the filter.
NOTE disreguard these bolts. It is too much of a pain in the ass to get nuts on the back and try to fit a socket in the recess. The only bolts holding the plexi onto the box are the two outer visible bolts. They are enough to get a tight seal all around.

I used 1/4" self adhesive foam weatherstrip around the perimeter of the filter. The filter is secured to the plexi with hex head stainless sheet metal screws.


On the backside of the plexi I used 1/2" self adhesive weatherstrip.

The plug is sealed with silicone.










