Seller notes

$ImageURL1$K&N 57S-4000 Performance Airbox Kit w/ Filter for Focus/C-Max/Transit Connect/5PART NUMBER: 57S-4000BRAND: K & NDESCRIPTION The K&N 57S-4000 Performance Airbox replaces the restrictive factory air filter and air box lid. K&N performance air boxes are designed to dramatically reduce air flow restriction as well as smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and accelerati...

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