I and three other guys dyno'ed Vettes in Smyrna TN a few years ago, switching between a K&N replacement and a clean paper, and the dyno proved, not increase in HP. However, there is an increase in dirt entering the engine.
(These dyno results are for replacment cartridges only, not for ram air or high velocity systems that use K&N type filters.)
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Black Sheep Hummer Squadron
(ME TOO)
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