AST BMW F83 M4 Cabriolet Lowering Springs 3 Series (F30 / F31) The result is repeatable alignment

The result is repeatable alignment and balance

Four-piston calipers with OE pads

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

with M applications such as E90 E92 E93 M3

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

AST BMW F83 M4 Cabriolet Lowering Springs 3 Series (F30 / F31) The result is repeatable alignmentGive 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