Adam, very interesting life you lead over there, the stress must be incredible, you need to pay us a visit and have break from it all. Back to Air Filters, I was looking to fit a K&N to my disco (before the dirt in plenum problem with the GT), went to local Parts suppler (who also builds and races Rally cars WRC) and he advised me not to fit a K&N or any other "Oiled cloth or sponge type Filter" as they didn't do a good job of keeping grit and dust out of the engine. I was suprised at this statement, so I spoke to a mate of mine who has a Zook that he raced in off-road events, same story and he gave me this web-site
http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm to check out, there is some very good data there and K&N have never challenged it to my knowledge. I am a mechanic and have seen the results of dust getting into engines, some people say it (the dust) gets burnt in the combustion process, but enough gets through to cause damage.
BTW contrary to popular belief overseas I have to drive hundreds of miles to get to the "Outback" and I haven't squished a 'Roo for years, good thing about paper filters is you can give them a quick cleanout (shaking or banging against the side) and you're on your way again, a good Idea if your travelling in bulldust areas is to have a "cyclonic" pre cleaner on your snorkel, anyway best of luck in NYC, Regards Frank.
