FunnelWeb’s profile cut foam effectively doubles the filters external surface area, without increasing the filters original size, enabling it to trap and hold far more dust on the outer surface. This means more protection to the engine while maintaining optimal air flow and extending filter service intervals.
Most FunnelWeb Filter seals are constructed from injection moulded urethane for a lasting, precise fit on the filter support frame and the inside of the air box. Foam seals, as fitted to other filter brands, will tend to stretch out of shape after a few cleans resulting in a poor fit to the support frame, possibly affecting the filters sealing ability.
Numerous combinations of foam profiles and porosities have been tested in harsh, dusty race conditions and test tracks to come up with the ideal combination. With the assistance of Australian KTM motocross and enduro race teams, more than 1,500 filters were manufactured, tested and either serviced and reused, or cut open for inspection before any were made available for sale.