QD EXHAUST MV Agusta Brutale 800 / Dragster / F3 / Turismo Veloce X-DB the Sound Controller (E4/E5 homologated)X DB sound controller by QD Exhaust for MV Agusta Brutale 800 Dragster 800 F3 800 Turismo Veloce 800 motorcycles. The X DB sound controller by QD Exhaust is a cutting edge modulation kit designed specifically for MV Agusta Brutale 800, Dragster 800, F3 800, and Turismo Veloce 800 motorcycles. As a QD Exhaust product, it exemplifies precision engineering and innovation, offering riders the ability to finely tune the exhaust valve to achieve their