The stock air cleaner housing for many Minis with single 1 1/2" SU carbs have historically been stuck with the paper filter. New from K&N is a replacement element for HS4 and all HIF that provides the benefits of K&N cleanable filtration within the standrad housing.
Just what injection engines require, this element will increase the breathingto the engine which can only result in better performance all round. Once fitted these special elements can last nearly a life time if cleaned and oiled regularly as per instructions.
Not for autos, this kit usually gives true power gaims of upto 6BHP. For the single point injection cars only with a single air hose. The twin point needs 2 hoses and is kit 57-0189.