Eibach Springs / Drag-Launch Competition-Pro-Kits are designed for Motorsports events which require the use of Original Equipment spring perches and seats.European Competitors in the demanding series types Group N, Group G, Rally, Slalom Autocross and many others depend on the performance found only in Eibach Competition-Pro-Kits. Drag-Launch-Kits are engineered to do only one thing: provide maximum traction to the drive wheels whether front or rear, import or domestic. The spring rates are precision engineered to improve weight transfer and control axle torque reaction resulting in a dramatic reduction in quarter mile times up to 2-4 tenths of a second.Eibach Competition-Pro-Kits provide the following Benefits: