1Compatible Model: Universal for cars. Such as, fit for 1 Series E90, fit for A3, and replacement for Benz W117. Designed for easy installation, no need for complex modifications. 2Improved Vehicle Performance: The rear bumper lip diffuser can enhance the airflow underneath the vehicle, reducing aerodynamic drag and improving performance and driving stability. 3Enhanced Vehicle Appearance: The rear shark fin diffuser adds a sporty and streamlined look to the vehicle's exterior, making it more visually appealing and personalized. 4Increased Safety: By increasing stability and traction, the rear shark fin spoiler helps reduce vibrations and shaking during high speed driving, improving overall safety and control. 5Strong Durability: Made from high strength plastic materials, the rear bumper lip diffuser offers excellent durability, abrasion resistance. It can withstand prolonged use and maintain a good condition.