You can get a Kahlenberg compressor and air tank.
http://www.kahlenberg.com/sites/defa...8_brochure.pdf
and one or two 10" Buell Horns...
http://www.buellairhorns.com/buell-1...-pr-16154.html
It may be a bit tight, but I think it can be done.
The other way is to go with some cheap Napa air horns...