Ramair Performance Foam Replacement Air Filter for BMW E46 316i & 318iUpgrade your BMWs breathing with the Ramair Performance Foam Replacement Air Filter for BMW E46 316i & 318i. Designed as a direct replacement for the restrictive OEM paper filter, this high performance panel filter improves airflow, enhances throttle response, and ensures long term reliability. Hand made in the UK, it features Ramairs signature twin layer Aeriform foam combined with a stainless steel cage for maximum strength and durability. The