>>I wish Ree would jump in on this<<
Ok..
The Airbox behind the Toms carb can be removed, tho it takes doing, and the airfilter isn't IN the airbox, so you could just pull the plastic airbox and chuck it, then jet to whatever size gets a good mix there.
On the back of the carb is a rubber boot kinda thingie, and under that is the airfilter, tis a metal screen type like old Batavas mopeds used, and as long as you have both of those, what do ya really need the airbox for, eh ?
I know of at least one guy who's run his Tomos that way, and he doesn't seem to have any problems, tho I wish I woulda thought to ask what jet size he's using with that.
-R