i have read everything i can find on this topic having "searched" it thoroughly.
it seems as though lots of folks move it "into or behind the airbox" or they put it under drivers seat or into the tool box.
how exactly does it fit in or behind the air box ?
or if it is to go into the toolbox are the wires long enough ?

One wire comes from behind the pulley cover and the other from the wiring harness, last mobil spot is right in front of the airbox.

That thing can run under water, you might keep it out of the sun though.

I've seen it mounted all over.  Under the seat on the fender, on the battery box, left side, front side, under the tool box cover.  on the right side of the rear fendar just above the swing arm.  Some said they put it in the air box, and I think some still had air running thru it.

So you're only limited by the amount of cable that's there.  Have fun.

I moved mine without extending any wires. To here:

if one were to put it in the tool box would it get enough air ?

I'd paint it gloss black to match the frame and mount it to the front of the tool box.

It wouldn't be too much of a problem. When your sitting still most of the heat goes up. While moving there is enough air flow that it disperses the heat enough that it should work fine.