[jct842]

Any lawn equipment shop will carry a briggs muffler, for a 10 to 12 hp one expect about $10 bucks. I think I used a 3/4" gas pipe coupling, same as a water pipe except no plating. Set it in lathe and removed the threads on one end so it would slip over the exhaust pipe right where I cut the OEM muffler off and welded it. Made bracket to support the coupling to bolt to engine where an original bracket was. Screw on the briggs and your done. BBQ paint on it once in a while......it does burn off in time. Muffler can't weigh more than 8 oz. so it is not going to ruin the pipe or crack off due to stress/