Originally Posted by Phreaky Phil
Here's my filter setup. Made for me by these guys http://www.uniflow.com.au/
They use your old paper filter, cut the guts out of it and fit their own. As the fillter is flat, spares can be carried without taking up much space. I used to find with the paper filters there would always be a fine layer of dust on the inside of the airbox. Not so with the foam type.
That's a much better set-up than the ones for sale over here. Really like the pre-filter and easy to wash top.
The ones they sell over here have a soft rubber outside that slides of the edge of the air box.
I'm thinking about trying this.
And put some waterproof pre-filters over them when doing river crossings to deal with the splashing of a bow wave.