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As it turns out, I installed a K&N FIPK on my '02 2500HD Duramax just today.
I'm not sure what you're referring to... my version of the FIPK included a metal housing that bolts to the plate that the old filter box sat on. I suppose you'd get better airflow from below if that plate wasn't there, but you'd have to get creative to secure the new K&N housing. Is this what you mean?
On my rig, there's now a noticable high-pitched whine during acceleration but the hp gains are noticable too. I also reprogrammed the computer with hypertech's power programmer III yesterday, which made a phenomenal difference. I'm saving my pennies to do the exhaust next.
One concern: If you happen to see an Allison Transmission lying on the side of the road, it could be mine... all this added hp has got to take it's toll, no? Is there a tranny performance upgrade that I should be considering?
Thanks,
Les
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