> The high air intake provided by the snorkel in the side vent is pretty
> good at getting cleanish air. I'd look at that assembly and make sure
> the tubing connections are sealed right all the way to the filter.

I finally change the air filter on my van, with the snorkel set up.
It had remnant indicators of some moisture having hit the paper
filter, by some of the folds being slightly warped, but there was
NO signs of dirt/dust on the filter. Surprising to me because I've
driven at least 3K miles of the 15K I've driven in that year, on
dirty/dusty roads. I "suspect" the moisture came from driving
at highway speeds, through heavy rains and the mist being
concentrated into the intake shorkel.

As Alistair says, I've used large hose clamps, and a very robust
piece of fuel filler rubber tubing (about 3" dia.) for the run up the
D pillar. The entire system is either hard plastic or rubber and
put together with clamps.

bob
'87 Syncro Westy