A coilover combines a coil spring and shock absorber into one integrated assembly. The coil spring is seated around a specially designed shock housing that mounts in place where OEM coil springs or MacPherson struts would be. Like any spring, coilovers serve to support the weight of a car or truck's body.Coilovers have been getting better and better over the years. No longer are the most expensive coilovers necessarily the best. Coilovers and shocks are parts of the suspension system on automobiles. The major difference between coilovers and standard shocks is that coilovers afford drivers much more control over a vehicle's suspension system.
Absolutely not. Since most coilovers are also going to allow you to lower the ride height, the spring and shock rate should be increased to avoid the suspension crashing and bottoming out. Doing so will offer a performance bump to most any vehicle.Unlike lowering springs, coilovers offer a much greater range of adjustability including ride height, spring pre-load, shock damping, and rebound. Typically, coilover sets feature even stiffer spring rates than a set of lowering springs alone, again sacrificing ride quality for cornering performance.