The ZeroSports Ball Joint Extender is ideal if you use your car as a daily driver but at the same time use it for track use on the weekends. The purpose of these ball joint extenders is to return the suspension geometry of the car to "stock" while allowing you to lower the car one inch (typically from the use of lowering springs). For those of you that run coilovers and adjustable cambers, this would be great to reduce the stress and the tension incurred on the control arms.