A 914 racer most of us know (let's call him "B") says that he's seen a measureable improvement by running either a K&N drop-in or running without the filter entirely, with the stock airbox. Obviously I've never dyno tested this myself, but I ran my final timed laps sans-filter at Buttonwillow a few weeks ago, and dropped a full 2 seconds compared to my previous best lap of the day. I can't attribute that all to filter restriction (duh), but it certainly didn't hurt! This was an OE filter with < 1500 miles on it.
Chris
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