I think that I have solved my dirty K&N filter problem.  As
you may remember I have a carb sitting on top of the
engine;  I took a rectangular plastic jug, cut out the
bottom to fit the carb plate, cut the top along 3 sides so
that I could get the filter in the jug I taped everything
back up again.  I taped some empty water bottles to the jug
(connected to the carb plate) and taped the water bottles to
a flexible snorkel to go up through the air intake panel on
the rear left side of the van and then ran more taped water
bottles up the side air intake to the top of the plastic
grill covering the air intake hole.  On our last trip, we
did a bit of sand driving and the K&N filter was still VERY
clean.  This is now very much a homemade Syncro air intake
set-up.

If you believe that a picture is worth a 1,000 words, go to
www.photopoint.com and enter my email address
(stebbins@aucegypt.edu) and at the album page click on the
K&N album to see a few pictures of the set up.  Cheers,
Malcolm