KW Suspension E9X M3 / E82 1M Height Adjustable Spring KitKW Height Adjustable Spring Kit: KW height adjustable springs kits used high quality springs made of chrome silicon steel and they are a great alternative to conventional springs. KW height adjustable springs kits give a more dynamic look. KW's sleeve kit for the E9x M3 E82 1M allows a large range of height adjustment while retaining the factory electronic damping control. The factory spring perches are removed from the front dampers, and KW's own