QD EXHAUST Ducati Superbike 1198 X-DB the Sound Controller (racing)X DB sound controller by QD Exhaust for the Ducati Superbike 1198. The X DB sound controller by QD Exhaust is a revolutionary modulation kit designed specifically for the exhaust valve of Ducati Superbike 1198 models. As a QD Exhaust product, it seamlessly integrates with the stock wiring and utilizes all OEM components of the bike, including the valve, servomotor, and cables. With the X DB sound controller, riders have complete control over their