I used a hammer and chisel, on the small rim, to knock the baffle out. Try not to damage the part around the rim. It takes a little time to work out, but will come out. After I got mine out I bought a Performance Exhaust Insert w/ spark arrestor for the factory muffler. It increased performance and added an aggressive sound, about $40. It slid right in and used the same retaining screw, worked great.