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Moto Guzzi NORGE 1200 Exhaust Silencer Muffler ST + dB killer medium Racing levers Hyperpro Progressive Springs for YAMAHAMoto Guzzi NORGE 1200 Exhaust Silencer Muffler ST + dB killer medium Dominator slip on silencer built for Moto Guzzi NORGE 1200 ST + medium (1200). Supplied with a removable dB killer insert. RACE USE ONLY not approved for public road use. Always check local regulations and venue noise limits. Key specs & features Includes removable dB killer insert. Medium insert option (as listed). Use to fine tune exhaust volume; results depend on silencer core and