I had the K&N FIPK on my '05 SUT for about a week, before it went to ebay. I saw no signinficant improvements, and it seemed to delay my throttle response. It appeared as though the box was not sealig against the hood, and hot air was being sucked up. WASTE of money IMHO.
Install is simple though, remove the factory box, and the massive piece of plastic that snakes around under the hood, and bolt the K&N on. Takes about 30mins.
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Semper Fi,
Michael
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