What is rebound damping?
A damper, also known as a shock or strut, has two ranges of motion. As the shaft of the damper extends out of the damper body, the damper is in rebound. In application, as your vehicle exits a bump, the dampers will rebound. The core function of rebound in a damper is to provide the roll control of the vehicle. Another function of damper rebound is to control the spring rate on the car. A car with too little rebound will be unable to control high spring rates. Much like putting an aggressive spring rate on a soft damper (like an OEM damper) will result in poor overall ride quality.