Hey Tim,
       I have a Tiico engine, and I use the snorkel, mainly because it came
with the engine and seemed like the right thing to do.  One problem I have is
that the snorkel will shift over time and vibrate against the side of the
body - loudly.  I was just considering myself whether or not to keep it.  I'm
not really sure what it's function is anyway, as I usually don't drive
through 3-foot deep water!
       As for the air filter, Peter B says someone is using a KN now, it's a
number RU-3031 or something like that (Call Peter for details to be sure).
It is a custom size, so the FLAPS will have to order it.
       Regarding power: even with the snorkel, it is nice.  I routinely pass
other cars going up mountains, and have hit highway speeds in excess of 100
mph/160 kph (not going downhill with a tailwind, either).  You will be
pleased when you get it installed.
       Enjoy your installation!

Bill Marshall
85 Vanagon/Tiico power