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Yamaha XT 660 X 2004 - 2016 Exhaust Silencer Muffler ST + dB killer medium Engine covers Yamaha YZF-R1M 2018Yamaha XT 660 X 2004 2016 Exhaust Silencer Muffler ST + dB killer medium Dominator slip on silencer built for Yamaha XT 660 X (2004 2016). 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. Insert diameter reduction: 660 mm to 200 mm. Medium insert option (as listed). Use to fine tune exhaust volume;