Ok guys heres a few pics of my mod. Its made out of 3" stainless tube, some stainless sheet metal and a 3" silicone 90 deg elbow (try to get one with a very tight bend radius) off Ebay worth about $19 from memory.
As you can see from the photos, I made an oval shape out of the sheet metal. I left 2 little legs at the ends, so the adaptor elbow can be pop-riveted to the inner guard, to give it strenght. Also drilled a 3'' hole at the windscreen end of the plate.
I mitred and welded the tube, to give me a 90 degree angle, then welded the elbow into the plate with a downward angle so it would line up with airbox inlet. The gap between the tube and the plate, needs to be kept to a minimum only enough to fit the hose and hose clamp about 5mm. Things are pretty tight in there! LOL
Then just mounted and sealed the adaptor, trimed the silicone hose to size and clamped it all together.
The diameter of the inlet of the air box was about 2.75", but the 3" silicone hose clamped down onto it without a problem.
This wasn't real easy to do, there stuff all room! but if ya handy with a welder you'll be able to do it. If you have any question please ask me, i'll try to help. Cheers Glenn