AST Suspension Lowering Springs (30mm/30mm) - 2013+ BMW 4 Series 420i/428i/430i/418D/420D/425D Coupe (F32) 6 this kit replaces your Infiniti

this kit replaces your Infiniti M37's stock suspension with a fully adjustable coilover system you can tune by feel

Part Number: RIV-B1401S

Fully customizable

and KSport damper internals bolt straight onto your BMW Z4

2015 Dodge Charger RWD

AST Suspension Lowering Springs (30mm/30mm) - 2013+ BMW 4 Series 420i/428i/430i/418D/420D/425D Coupe (F32) 6 this kit replaces your InfinitiAST Lowering Springs for the 2013+ BMW 4 Series (F32) are manufactured from a premium high tensile chromium silicone wire which is handpicked by AST engineers for its quality and metal consistency. Each spring is cold wound and then heat treated to increase hardness and reduce internal stresses present after winding. Each spring is then individually shot peened, phosphate treated and then powder coated to outlast even the life of the vehicle. Features