INSERT ONLY for factory Yamaha muffler. See description for full list of fitments. The end of this baffle is NOT exact to this application. Only difference is it does not have the downward spout type end. INSERT ONLY for the factory Yamaha mufflerThis measures 48.15mm outside diameter, where it meets the inside of the mating surface of the muffler body.Fits: Yamaha1987-96 Big Bear 350 YFM350FW1993-95 Kodiak 400 YFM4001985-89 Moto-4 YFM2001986-88 Moto-4 YFM2251989-91 Moto-4 YFM2501987-95 Moto-4 YFM350ER1992-00 Timberwolf 250 YFB250 2x4/4x41983-86 Tri Moto YTM200 YTM2251987-04 Warrior 350 YFM 3501995-05 Wolverine 350 YFM350FXThe end of this baffle is NOT exact to this application.Only difference is it does not have the downward spout type end.1996-99 Big Bear 350 YFM3501996-98 Kodiak 400 YFM400