Gee, they're only letting through four time as much crap into your combustion chambers :rolleyes:
Considering the amount of air that passes through your engine (approx 14.7 kilograms of air for every litre of fuel) there is a huge difference between 99% and 96%. I recently changed my filter from a K&N job to a standard paper filter and I will never look back. The car is significantly quieter, doesn't have that irritating "thumping" sound at wide open throttle and it had absolutely ZERO impact of performance.
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