Black VOCA Racing double-layer air filter. The new very performing VOCA Racing air filter are manufactured of high quality materials. This new filter is based on a doble layer system. The exterior layer consists of big pores which assure a good flow of air. In exchange the interior layer consists of fine pores to optimize filtration. The combination of different textures leads to increased performance. The VOCA race filter has been developed for big carburetors such as KEIHIN PWK and VOCA FT. Connection d.= 48mm. The VOCA Race Filter comes with a straight and a curved adapter. Available in the classical VOCA colors red and black.