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AST Lowering Springs For BMW 4 xDRIVE 420i/428i/430i/420D xDRIVE 07/2013-10/2020, Front 30 , Rear 25 M5 (F90) You have already sent yourThe AST Lowering Springs are engineered specifically for BMW 4 xDRIVE models 420i, 428i, 430i, and 420D xDRIVE from 07 2013 to 10 2020. Manufactured with precision using the best Wafios coiling machines, these springs provide a reliable and high quality solution to enhance your vehicle's driving dynamics. Designed to lower the vehicles center of gravity by 30 mm at the front and 25 mm at the rear, these springs improve handling and stability without