[Technick]

As a general ruel springs do NOT mke for a harsh ride, unless you have like big-block springs in a small block car. It is the shocks and struts that control the ride quality. If you put a better spring on the car but leave the stock shocks and struts on the car the ride quality will suffer. The stock shocks and struts were designed to control a stock spring, not a higher rate spring, or progressive rate or specif rate, basically any aftrermarket spring. The shocks and struts are designed to control the spring oscillations, you know, jounce and rebound. By putting a higher rate spring in the car the shock and struts can no longer control the spring oscillation, resulting in a harsh ride. If you improve the quality of the shock and strut to match the spring then the ride quality will come back.