BMW F9X X3M X4M Panel Filter Replacement Set you have three material options

you have three material options

Here is a comparison between the stock and carbon tubes

This smooth reduction in cross sectional area invokes the Venturi effect where the airflow accelerates whilst maintaining laminar conditions

TECHNICAL DATA

Porsche 991 GT3 RS

BMW F9X X3M X4M Panel Filter Replacement Set you have three material optionsEventuri have redeveloped the OEM panel filters using a high flow non woven filtration mesh which is encased in a highly durable stainless steel mesh. The filtration element allows for less restriction while maintaining suitable filtration properties. The mesh is captured in a Urethane surround which is very stable at high temperatures and retains its shape to allow for an adequate seal at all times. Each set comprises of 2 small and 2 larger filters