The Koni STR.T Sports Suspension Kit combines lowered H&R springs and sports fixed rate dampers for a suspension kit that bolts straight on, with no further adjustments or set up required.The Koni technicians have individually tailored and engineered the kits to each specific vehicle application to give a kit that delivers a great driving experience. Koni have matched H&R lowered sport springs and their own fixed rate dampers lower the ride height and improve handling. Car control and steering feedback are improved, whilst the ride quality remains excellent for everyday driving use.The high quality components used in manufacturing the kits ensure durability and long lasting driving pleasure On vehicles where sports suspension is a factory option (e.g. Audi S-Line, BMW M-Sport, Mercedes AMG-Line) the lowering amount shown is for vehicles without. If your vehicle has optional sports suspension you will have to deduct the amount the vehicle is already lowered by. This can be up to 30mm.