AST Lowering Springs For BMW 4 420i/430i/420D 07/2020-, Front 40 , Rear 40

The AST Lowering Springs for BMW 4 420i/430i/420D (07/2020-) are engineered to provide a precise reduction in ride height while maintaining the driving comfort expected from OEM components. Manufactured using advanced cold-coiling technology on premium Wafios machines, these springs ensure consistent quality and durability. Designed specifically for the front and rear suspension, with a lowering of 40 mm each, they effectively lower the vehicle’s center of gravity, enhancing handling dynamics and stability without compromising everyday usability. These springs offer a progressive spring rate, allowing for a smooth transition in suspension stiffness that balances performance improvements with ride comfort. The materials and manufacturing processes meet rigorous standards to guarantee longevity, supported by a lifetime warranty against breakage. This assurance reflects AST’s commitment to reliability and customer satisfaction. AST Lowering Springs are a direct replacement for the original springs, tailored for the specific vehicle model. They provide a refined driving experience by reducing body roll and improving cornering response, making them suitable for both daily driving and spirited performance situations. Their compatibility extends across a wide range of vehicles, with precise engineering to fit the BMW 4 Series models specified. Notes Not suitable for 4WD (four-wheel drive) cars. Approximately 10 mm less lowering for vehicles equipped with M-sport suspension. Approximately 10 mm less lowering for vehicles with Adaptive M-sport suspension. Lowering Specifications Front lowering: 40 mm Rear lowering: 40 mm Progressive spring rate for balanced comfort and performance Cold-coiled using advanced Wafios machinery for precision and durability Lifetime warranty against breakage Compatibility Designed specifically for BMW 4 Series 420i, 430i, and 420D models from 07/2020 onward Direct OEM spring replacement Not compatible with four-wheel drive vehicles Adjustments in lowering height for M-sport and Adaptive M-sport suspensions