Panel Filter Bmw E46 M3. Panel Filter Pair The Eventuri panel filters are made using the same design philosophy of their full carbon fiber intake systems: cutting edge design, rigorous testing and prototyping methods. With a focus on performance, each design undergoes CFD analysis and is then validated at the prototype stage through volumetric airflow, intake temperature and extensive dynamometer testing. Eventuri publishes all the development information to illustrate the depths they go to in bringing an intake from concept to reality. Each panel filter is built to fit in the OEM air filter housing. *By request/order.