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Dan,
I also prefer simplicity.  You can have good filtering 100% of the time and good
ram recovery simultaneously.  With a high quality filter, such as K&N, of
sufficient size you can reduce the induction losses to very small levels.  With
my installation at 4500', MP is 1.2" above the MP shown in the Lycoming zero-ram
engine performance chart for the same altitude.  My MP tapers down to about
equal the Lycoming zero-ram number at 18,000'.  So even up high, where IAS is
relatively low, the ram effect still overcomes all the air box induction losses
including the filter.
My engine is carbureted, so I do have carb heat which also blocks off ram air
when engaged.  Alternate air for an injected installation would be much simpler.
For those running filtered air through a filter from in front of the #2
cylinder, I am curious what the induction losses are or what full throttle MP is
at takeoff.  I have seen some of these installations at the Lancair fly in, but
didn't think to ask at the time.
Chris Zavatson
L360std
N91CZ
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