AST Suspension Lowering Springs - BMW 4-Series (07/2013-10/2020)AST Suspension Lowering Springs Part #: ASTLS 21 034 Overview The AST Suspension Lowering Springs are designed to enhance the handling and aesthetics of your BMW 4 Series models from 2013 to 2020. Crafted for enthusiasts seeking a sportier stance and improved road feedback, these springs provide a balanced combination of performance and style. They are ideal for drivers looking to lower their vehicles center of gravity, resulting in sharper cornering,