QD EXHAUST Ducati Hypermotard 821 X-DB the Sound Controller (racing)X DB sound controller by QD Exhaust for the Ducati Hypermotard 821. Experience ultimate control over your Ducati Hypermotard 821's exhaust sound with the X DB sound controller. As a cutting edge QD Exhaust product, it is a modulation kit designed specifically for the exhaust valve system. It seamlessly integrates with the stock wiring and utilizes all OEM components of the bike, including the valve, servomotor, and cables, ensuring compatibility and