Youngunner
Adventurer
Take a look at some pre-cleaners. Sy-klone (link below) has a video of them feeding snow into the intake. I just picked up a Topspin off ebay. There are some other guys on the board running these and some from other companies. They are kind of hard to source though, it takes some searching.
Donaldson or Wix Topspin
http://www.donaldson.com/en/engine/support/datalibrary/000207.pdf
Sy-klone
http://www.sy-klone.com/mm5/merchant.mvc
Engineaire
http://www.enginaire.com/Composite%20Precleaners.htm
Donaldson or Wix Topspin
http://www.donaldson.com/en/engine/support/datalibrary/000207.pdf
Sy-klone
http://www.sy-klone.com/mm5/merchant.mvc
Engineaire
http://www.enginaire.com/Composite%20Precleaners.htm