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This is the Inner Piece part of a three piece set of parts that make up a velocity stack / air trumpet for the ZX9R Kehein CVR carburetor. This part needs to be ordered in conjunction with an 'Bellmouth' part and a 'Carb Mating' part per carb.
This particular Inner Piece part gives a 90mm induction tract when added with the other standard parts
The Mating Part bolts to the CVR carb, holding the Inner Piece in place as it does so. The Bellmouth part is pushed onto the end of the Inner Piece and held in place with a 4mm wide tie wrap. Simple!
The set of parts gives the carb a 90mm induction tract in total, which should be much more suitable to car installations than the stubby Kawasaki originals.
They are designed to be installed within an air filter and come with a tabbed flange for that purpose.