Howdy Folks,
I know this has been mentioned before, but today I saw it for myself. I
recently performed a Subaru transplant on my '91 2WD automatic transmission
Carat. In the course of cleaning things up, today I removed the snorkel duct
and intake from the RH rear body pillar that used to feed air to the air
intake on the VW air filter, (not being used now). The assembly consists of
a plastic air intake opposite the RH grille at the top facing rearwards
retained by two rubber bushings, an oval shaped hose (think of a larger
version of the old air-cooled fan duct hoses) and a bottom elbow with a
drain hole attached to a false wall (that you see the plastic air filter
hose in the engine compartment RH side attach to) with a pop rivet. I pulled
the whole assembly out though the engine side and disassembled it. The inner
paper portion of the hose connecting the intake plastic to the elbow at the
bottom had separated and bunched up in various places and was blocking flow
by approximately 50 to 75%. No, I had not had any drivability problems with
the old engine except in cold  (32 degrees F) foggy weather, when
occasionally it would run rich and bog (any aviators recall rime or impact
ice? Hey, I'm just an A&P mech).
At least in the interest of air flow efficiency, it might be a good thing to
look at.
Thanks,
Dave Milo