Hi a couple of years ago I removed a worn out Tecumseh OH160 from a ST16 and installed a B&S opposed 18 HP was very pleased with it and how it ran but the engine had lots & lots of hours on it and it used alot of oil so this winter I overhauled the B&S and reinstalled it in the tractor, had been using 2 3/4" pipe mufflers but wanted to try and fabricate a single muffler so this week I got busy and built a muffler and it looks good and I like how it sounds. Used of 2.5" tube (and old drive shaft tube) 15" long cuts 3 holes in it 2 for tubes from the engine and one outlet, used 3/4" pipe for the tubes from the engine into the muffler drilled 20 1/4" holes in the inlet pipes used some 1" EMT also drilled 20 holes 1/4" & 9/32" welded the pipe / tubes into the 2.5" round then welded a couple of end caps on installed it on the engine to see / hear how it preformed I liked it so its in the paint room now.
