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As used in the mountune MR420 upgrade; the X4 induction kit gives an additional two points of entry, improves the pressure drop across the intake and enhances induction noise.
The lower air intake is installed as a direct-replacement panel which can be unclipped and removed on the OE bumper/grill. The mountune panel features a vac-formed duct with a sunken m logo and is supplied with 5 in-fill decals to allow for individual personalisation (yellow, blue, green, white and red).
The kit also features a porous air hose (to prevent water ingress) that feeds cold air to the lower half of the airbox and connects via a modified vac-formed top-hat fitted in the base of a new OE airbox.
A high-flow wire-reinforced silicone hose is also utilised as part of the kit and is available in four colour options; black, green, blue or yellow.
The X4 induction kit is fully compatible with the OE airbox and has been designed to work effectively with the mountune Focus RS airbox.