AST BMW F83 M4 Cabriolet Lowering Springs 3 Series (F30 / F31) Progressive-rate coil design for responsive

Progressive-rate coil design for responsive handling with compliant ride quality

We have installed these rear rotors on customer E87 120i cars and the feedback is consistently positive

strong clips and a motorsport-inspired look that complements factory Shadowline and black styling packages

more assertive tone and a freer-breathing exhaust when paired with a Milltek Sport rear system

AST BMW F83 M4 Cabriolet Lowering Springs 3 Series (F30 / F31) Progressive-rate coil design for responsiveGive your BMW F83 M4 Cabriolet the extra stance it needs with AST lowering springs. AST Lowering Springs 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