If you are building a custom turbo kit and need an air filter we have you covered? This filter is constructed of a rigid cotton gauze material and features urethane ends. The filter comes pre-oiled and can easily be cleaned and re-oiled when needed. This is the same filter used in our S6, A6, and S4 intake sysytems

Specifications: 

Inlet 4"

Filter Length 6"

Small Side Diameter 4.5"

Large Side Diameter 5.5"