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Old 06-11-2000, 11:31 AM
Posts: n/a
One thing I have not seen addressed in this firestorm on air filters is the fact that manufacturers are designing intake systems with the airbox operating at a specific resonance. When that resonance is altered, horsepower and torque are affected, especially in the top ranges.
My brother learned this on his racing motorcycle, when a factory tuner showed him the dyno results with the K&N and without it. He lost several top end horsepower with the K&N and the factory man showed him some other modifications that were much more effective.

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