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The K&N 57S Performance Airbox replaces restrictive factory airboxes on a range of compact models including Ford C‑Max and Focus II, Volvo C30/S40/V40/V50/V70, and Mazda 3/5 applications listed by K&N. It uses a smooth, mandrel‑bent inlet and oversized conical K&N filter to reduce restriction, increase usable power and acceleration, and extend service intervals. Systems are backed by K&N's Million Mile Limited Warranty; check local emissions compliance.
K&N Performance Intake Kit for Ford C-Max/Focus II / Volvo C30/S40/V40/V50/V70 / Mazda 3/5
