Unitronic Air Filter - Audi RS6/RS7 (C8) 4.0TT 2021+This high flow pleated dry cotton panel filter is designed to fit all Unitronic Carbon Fiber Intake Systems for the C8 RS 6 and RS 7 equipped with 4. 0TFSI engines. This filter offers optimal airflow for most applications while protecting your turbochargers and engine from debris and air particles that may be encountered during everyday and spirited driving. Hardware Included 1 x High Flow Pleated Dry Cotton Panel Filter Related Hardware 54mm Adapter