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Message: [QUOTE="Suns_PSD, post: 84945, member: 849"] The 6637 is a paper (read higher efficiency) filter so it is more restrictive than cotton gauze. Modified (hell even darn near stock) these engines need all of the unrestricted air flow that they can get. As far as I'm concerned 2 filters is the only way to accomplish that. I wedged some huge freeflowing air filters on to my truck and all of them maxed out my restriction gauge by about 1/2 throttle. Going to 2 filters made a tremendous improvement in response, smoke, boost, power, etc... Also, I drive dusty roads and parking lots every time I take my truck out and my last oil analysis w/ the twin filter set ups had my silicone at like 3. Extremely low. And I haven't even cleaned those filters in years, they are completely black w/ dirt. But I have no restriction or silicone so I'm not changing a thing. When you greatly reduce the restriction as I have you also greatly reduce the suction acting to pull dirt into your intake. For instance I sell Kenworths and I noticed years ago that if a single 15" air cleaner will last say 10K miles before swapping, dual filters will last maybe 80K miles, not just 2x like you would suspect. It's because of way less suction force at any one time. [/QUOTE]

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