i might be talking b*******s but can you not do away with the air box and fit a couple of K+N filters straight on to carb intakes?
something like these ;
http://www.knfilters.com/universal/universal.htm i appreciate that these may upset the dyno kit if you have one etc
i dont know if there is enough room to do this its too cold to have a quick look at my own bike to check but i would consider it to acheive what i think you are trying to do i have used these on several cars in the past with a bit of main jet and needle tinkering i had good results
or is this against the rules?
[Edited on 26-2-2005 by monstermob 998]