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I used to supply K&N filters many moons ago but changed to Pipercross. The reason was that when it rained heavily and the car was driven through road spray the K&N would let water droplets pass it's wire gauze element and saturate the airflow sensors, thus causing the engine fault line to illuminate and in some cases actually damaging the sensor which required replacing £££
Pipercross use a foam sponge material where this problem does not happen.
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