K&N's 57S Performance Airbox Lid & Performance filter upgrade - 57S-4000 Summit Made from stainless steel

Made from stainless steel

The addition of the cooler will ensure that the fluid stays cool even through intensive driving

Please note that those vehicles fitted with catalytic converters as standard should remove them for competition / display use only

Perfect for track going ST150's

Instantly transform the look of the front of your mk3 focus ST

K&N's 57S Performance Airbox Lid & Performance filter upgrade - 57S-4000 Summit Made from stainless steelK&N filters have just launched their Gen1 Air box lid modification complete with K&N filter element, bolt on power in a matter of minutes. TUV approved for Europe, fits lots of applications Focus Mk2 RS Focus Mk3 ST250, Zetec S 1. 6 & 1. 6 Eco Boost, 1. 1 Eco Boost K&N's 57S Performance Airboxes increase horsepower and acceleration by dramatically reducing air flow restriction caused by the original factory design. They come with K&N's Million Mile