Suspension lowering is a popular form of suspension tuning. Aside from better styling, suspension lowering improves handling characteristics of cars. Lowering the suspension drops the center of gravity of the car and reduces drag. The lower center of gravity minimizes roll when making high-speed turns. If you are into performance driving, this means you are more able to follow your desired driving lines. The reduced drag improves both acceleration and maximum speed.
However, there are some significant downsides to lowering the suspension. The first is ground clearance. You will have more problem with bumps, potholes, and road debris hitting the lower body and components of your car. Ramps that you never noticed before are now a constant issue. Your car will be more constrained when it comes to driving on certain roads. As a driver, you will have to be more careful. A shorter stroke increases the chances of the shock absorbers bottoming out. Bottom-outs are not only uncomfortable but can also damage other components. A spring mount, for example, can become deformed or crack from the impacts of bottom-outs.
Some people say that suspension lowering makes the ride quality unbearable. Although this is generally true, most modern lowering solutions are designed to retain the original ride comfort. Lowering dampers and adjustable shock absorbers allow tuners to drop the height and reap the performance benefits while keeping the car as comfortable as possible.