The AST 5200 Series Coilovers for 15-18 BMW M3 F80 LCI / 15-18 BMW M4 F82 LCI are a high-performance suspension system designed to provide superior handling and improved ride quality. The adjustable dampers and springs allow for fine-tuning of the suspension for the desired driving experience, while the monotube design ensures consistent performance. The 5200 Series Coilovers are corrosion-resistant and feature an adjustable spring preload for optimal performance and comfort.