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Part of the reason the K&N systems show hp gains is the cleaning up of the intake tract. The rubber bellows on the stock system is not very clean internally from an airflow standpoint. Some turbulance is desireable in the intake path after the fuel is introduced to the incoming air. Modern thinking is that a tumbling air fuel mixture keeps the fuel more atomized and leads to a more consistant flame front in the combustion chamber. But for the incoming air to the throttle body staight and smooth is the path you want, and K&N does a pretty good job of that on their systems.
Last edited by Topspin : 06-04-2008 at 10:49 AM.
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