AST Suspension Lowering Springs - BMW 4-Series (03/2014-07/2021)AST Suspension Lowering Springs Part #: ASTLS 21 040 Overview The AST Suspension Lowering Springs are designed to enhance the handling and aesthetics of your BMW 4 Series models manufactured between March 2014 and July 2021. Crafted for enthusiasts seeking a sportier stance and improved road feedback, these springs help lower your vehicle's ride height for a more aggressive look while maintaining ride comfort and stability. They are ideal for drivers