Exhaust silencer muffler DOMINATOR ROUND 1987-1989 YAMAHA XT 600Yamaha XT 600 1987 1989 2KF Exhaust Silencer Muffler ST + dB killer medium Dominator slip on silencer built for Yamaha XT 600 (1987 1989). 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: 987 mm to 198 mm. Medium insert option (as listed). Use to fine tune exhaust volume; results depend on silencer core and engine