CTS Turbo universal 3.75" low-profile cone air filter, the replacement filter for the CTS-IT-800 N55 intake kit (and a drop-in option for other 3.75" custom intake builds). Molded silicone base and cap with a tapered shape to fit tight engine bays, stainless steel clamp included.

Fitment: Universal 3.75" intake pipe fitment - used on the CTS N55 intake kit (135i/335i/435i/M235i/M2) and compatible custom turbo intakes.