AST 30mm/25mm F&R Lowering Springs | BMW 3 Series F31 (2012-19) (ASTLS-14-399)AST ASTLS 14 399 Part #: ASTLS 14 399 Overview The AST 30mm 25mm Front & Rear Lowering Springs are designed to enhance the stance and handling of your BMW 3 Series F31 (2012 19). Crafted for enthusiasts seeking a sportier look and improved driving dynamics, these springs provide a lower ride height that reduces body roll and improves cornering stability. Made from high quality steel, they are engineered to deliver durability and consistent performance