Dinan Performance Spring Set, part D100-0928. Designed for 2014-2020 BMW 228i/230i F22 and 428i/430i F32 applications. MAPerformance confirms the part number and application. Dinan springs reduce body roll and improve handling while lowering ride height, with calibrated rates engineered to maintain usable suspension travel. The set should be paired with the corresponding Dinan Supplemental Ride Quality & Handling Kit for the advertised ride quality and handling characteristics. Not compatible with xDrive applications.