About Lowering Springs
Aftermarket springs are commonly used to lower the ride height and to reduce
body roll. This is also often done when upgrading to a larger wheel and tire
package. Generally speaking, the stiffer the spring rates (the amount of
resistance a spring is set for against compression), the softer the sway bar
setting can be set in order to achieve a similarly flat cornering response.
When trying to decide which lowering springs are right for you, your goal should
not be to drop down the car as far as possible. In many cases, overly "slammed"
cars may actually be illegal for road use and terrible performers. The ideal
range of adjustment should be 0.5 to 2 inches using traditional lowering
springs. Any lower, the height of the perch should be adjusted by using a
ride-height adjustable coilover suspension.