Recently broke the exhaust stack off my massey 184. I'd didn't take much to knock it over as it is the stock exhaust and was rusted pretty thin. So I pretty much need a new setup. It just came to my attention that the exhaust stack is small for tractors that size (1 5/8" on the top of muffler). What size exhaust pipe should be on a 68 hp diesel tractor? What kind of muffler can I use? Will it damage anything if I use it for a few mins without exhaust?