AST ALS Adjustable Lowering Spring System - BMW M2 G87/M3 G80, G81/M4 G82, G83 20+AST suspension lowering springs will lower that center of gravity without giving in a lot of the comfort you are used to with the OEM springs. The lowering springs are a direct replacement of the OEM springs and have been developed especially for each vehicle specific. Made out of the best material on the best Wafios coiling machines available. The ALS system incorporates specially designed spring seats which allow on car adjustment of the springs.