Blow air toward the windshield and side windows to quickly remove fog, frost and snow, ensuring clear driving vision. Accelerate interior air circulation, reduce humidity, eliminate odors, and improve overall air quality inside the car. For A3 For S3 For RS3 For Sportback 81A 2017-2021 No drilling , you don't need to use other complicated tools, or even need to modify it, the installation is simple. Driver visibility preserved with optimized airflow design, reducing air resistant while maintaining AC efficiency, for a smoother driving experience, Manufacturer: CSSPDM