QD EXHAUST Ducati Hypermotard 939 X-DB the Sound Controller (racing)X DB sound controller by QD Exhaust for the Ducati Hypermotard 939. The X DB sound controller by QD Exhaust is a cutting edge modulation kit designed specifically for the exhaust valve of the Ducati Hypermotard 939. This innovative QD Exhaust product seamlessly integrates with the stock wiring and utilizes all OEM components of the bike, including the valve, servomotor, and cables. With the keypad system of the X DB sound controller, riders can