check where the pipe goes into the muffler. There should be a sleeve. They call it a muffler gasket.
https://www.amazon.com/CALTRIC-EXHAUST-MUFFLER-TIMBERWOLF-1992-1998/dp/B01M0C3NXF/ref=sr_1_5?crid=2OP4QFKBQ8AE9&dib=eyJ2IjoiMSJ9.SlDTBnTn3RkQc2ZlXtC4QTx5mgNDTEq0Ri9T27PTzRJYyUnT6oUWE8IirYH0-m3hsmfps4rAxOq3zrSILCdJ_yfT5NY5NGtRBpRQY8Kv7PksxJ-wbNGrlb-_C-s85pn45ANa6F6y6WLJ8VRFvFsvKiZpxXONtUC7X4pri_h_F2O1RYRRWS9A2ad8Xn1xjUl_AJdoS_-eT6HiACjfvER9qeW9BAX9Whp8fQiN9u2dOGFmj8zSYpvn_rSOCmbw5mcuPsIxiyf0KwtZCxdK2wqaHWLF4AtKzij_myIeyBYWSrg.Q_Mg2wLqyKQu4vzs0uj_iAfzMtePIKdHHjT6zz_EHus&dib_tag=se&keywords=1997+yamaha+timberwolf+exhaust+gasket&qid=1724176294&s=automotive&sprefix=1997+yamaha+timberwolf+exhaust+gasket%2Cautomotive%2C156&sr=1-5