The AST 12-15 BMW M3 F80 / 12-15 BMW M4 F82 Pre LCI 5200 Series Coilovers are designed to provide exceptional performance and handling for BMW vehicles. These coilovers feature a 5200 series monotube design with adjustable rebound and compression damping. The 5200 series also features an adjustable spring preload that allows for fine tuning of ride height and corner balancing. The coilovers are designed to provide increased grip, improved responsiveness, and improved stability. They are also corrosion resistant and designed to last for many years.