BMW Timing Chain Rail "Guide Rail" (U-Shaped Rail) | 1996-2003 Manufacturer:Febi Bilstein Optimized Airflow Transition: Smooth transition

Optimized Airflow Transition: Smooth transition from the circular filter housing openings to the single air entry point maximizes flow efficiency

leading to increased exhaust flow

you will need to file notch as original

and a significantly enhanced exhaust note

Reduced Restriction: Significantly less restrictive than the bulky factory over-axle pipes

BMW Timing Chain Rail "Guide Rail" (U-Shaped Rail) | 1996-2003 Manufacturer:Febi Bilstein Optimized Airflow Transition: Smooth transitionTiming Chain Rail "Guide Rail" (U Shaped Rail) for 740i (1997 2001), 740iL (1996 2001), 840Ci (1996 1997), X5 (2000 2003), Z8 (2003), 540i (1997 2003)