10v air filter upgrades?

[todd@qualmedoregon.com]

I'm curious: how many people have upgraded the air filter
setup on a 10v?  I have an '84 4kq and am investigating my
options for putting in a high-flow filter.  So far, the 
easy way seems to be either punching holes in the stock
airbox, or buying the contraption from Blaufergnugen!(TM)
that clips on to replace most of the factory unit.  Has
anyone used this thing?  I'm looking to gain horsepower
(and, yes, to sound more "aggressive" under acceleration).
I'm especially interested in devising a custom setup with
a cone-type filter: what kind of ductwork can I use, how
would I attach it to the intake, and where under the hood
is a good high-pressure spot to locate it?