K&N's 57S Performance Airbox Lid & Performance filter upgrade - 57S-4000 Summit Fitting time - 20-30 minutes

Fitting time - 20-30 minutes (ramp & a good tool box) - NO Drilling or modifying required

Made from stainless steel

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

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 Fitting time - 20-30 minutesK&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