QD EXHAUST Ducati Superbike 848 X-DB the Sound Controller (racing)X DB sound controller by QD Exhaust for the Ducati Superbike 848. The X DB sound controller by QD Exhaust is a cutting edge modulation kit designed specifically for the exhaust valve of the Ducati Superbike 848. This innovative QD Exhaust product seamlessly integrates with the bike's stock wiring and utilizes all OEM components, including the valve, servomotor, and cables. With the X DB sound controller, riders can effortlessly modulate the exhaust