air box mod:
some trimming was required. I had to get a second air box because I trimmed a little too much on the 1st one. It could have worked but would have look funky.
Here you can see at the bottom where I trimmed too much.
You just need to trim enough for the KDX boot to fit snuggly inside the box.
I made a back plate out of steel, I started with aluminum but it was too thin and flimsy, I'm pretty sure it would have bent/broke after awhile.
That plate goes on the outside of the box and can replace the stock KDX aluminum ring, I kept mine just cuz I painted it green and wanted to use it
I reused 3 of the KX existing hole (used to secure the air filter on the boot) to secure the plate, then sealed it in place with silicone.
I drilled 2 holes in the airbox for the filter holder, make sure they are big enough for the plastic part of the holder to fit inside and make tight good seal against the boot. that's also why I added that aluminum piece as backing on top and bottom (not shown on pic). This needs to be as flat as possible to get the rubber boot tight against the filter holder.
You basically want the boot sandwiched between the air filter holder, and the air box. hard to explain, I should have taken pics there. If you look at how the KDX air box, boot, filter holder goes you'll see what I mean.
I sealed the boot and holder with silicone to be safe (on the outside only, didn't want to risk any silicone getting loose and screwing up the engine)
and I could have bought a welder.
