Eibach Pro Kit Lowing Spring. It lower 1.6" Front 2.0" Rear. Pro Kit - the legendary spring system that dramatically improves both a vehicle's performance and appearance. By lowering the cars center of gravity, the Pro Kit reduces "squat" during acceleration, body roll in corners and excessive nose dive under braking. The Pro Kit is the choice for auto enthusiasts everywhere, including factory installations by Ford, Toyota, Audi, and others.