Diz Jr,
I had the 129/149 style muffler installed on a K341. Threaded pipe into the exhaust port and where it would bolt to the heat shield was bolted to the frame. The engine showed no signs of choking on it's exhaust.
I personally did not like the set up because the tractor was being made into my snow remover and I just knew I'd wind up plugging the pipe with snow. I have since changed the engine back to a K241. Sometimes I still think about giving it a stack. But after seeing a cracked exhaust port I drop the idea.
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