Like the H&R Street Performance Coil Over, the H&R PCS Coil Over is engineered for street use, but has a number of new features designed for the enthusiast who desires an adjustable shock dampening feature. No fastenesr or tools to fuss with all it takes is the turn of a knob to adjust your suspension calibration. With H&R PCS Coil Overs, nose-diving under hard breaking is virtually eliminated. And, unlike traditional twin-tube shock absorbers, H&R PCS Coil Overs feature a state-of-the-art mono-tube gas shock.