The 'wool sweater' around the air filter isn't to trap fine dust, rather
the reverse - the butterflies, bits of grass, and other debris that manages
to get up the snorkel and into the filter housing. My truck came with it
wrapped around the stock paper element, and I've continued to use it with
my K&N. It does a nice job of keeping the bigger debris out of the bottom
of the folds of the filter.
BTW, I leave it dry, although there seems to be enough oil mist from the
valve cover breather to get at least the half facing that hose pretty well
oiled. I suppose if you wanted some extra dust protection, you could oil
it like the K&N. Oh - one last word about handling the 'sweater'. While
the fuzz appears to be spun plastic, the backing is fiberglass. When you're
washing it out, don't wring it dry, but let it drip dry; otherwise you'll
break up the fiberglass and get itchy hands. Gee, wonder how I learned that?
Could this have been standard with the towing package? Or 4x4?
Jim
"There is already a ban on ALL CRIME. It is not working." - Thomas Sowell
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