BMW 48 cm Universal Front and Rear Bumper Lip Spoiler Diffuser Splitter Material and finish: Made of PP material with a UV transition paint finish. Surface is scratchresistant, water resistant, and weatherresistant for longterm use in diverse environments. Function and performance: The spoiler disrupts airflow under the vehicle to help maintain rearwheel grip, while reducing aerodynamic drag. This can contribute to improved fuel economy and better speed stability. Professional design: Front bumper lips are engineered to increase front downforce, limit air entering beneath the car, and help stabilize the vehicle body during dynamic driving. Size and compatibility: 4,8 cm length, designed as a universal front and rear bumper lip spoiler diffuser splitter for BMW applications. Use scenarios: Daily driving on BMWs to enhance stability and aerodynamic balance at highway speeds. speed highway or longdistance motorway driving to improve fuel efficiency and cornering stability. Trackday or spirited street driving where extra frontend downforce and reduced underbody airflow can support more predictable handling.