AST Suspension Lowering Springs (30mm/25mm) - 2009-2018 BMW Z4 Roadster 18i/20i/23i/28i/30i (E89) Chaser Spring rates and damping are

Spring rates and damping are pre-tuned for the Z31 Nissan 300ZX chassis so the coilovers bolt onto your 1983-1989 Nissan 300ZX ready to install

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AST Suspension Lowering Springs (30mm/25mm) - 2009-2018 BMW Z4 Roadster 18i/20i/23i/28i/30i (E89) Chaser Spring rates and damping areAST Lowering Springs for the 2009 2018 BMW Z4 (E89) 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