I used the tractor while cleaning horse stalls today, its not obnoxiously loud so much as it has that 'Brrrraaaaaapppp' of an '80's 4cyl Ranger with a glasspack... Yuck.
I took it all off, and put the stock stuff back on for now. I think I can split the case of the muffler I built, modify the baffles, and weld it back together with minimal issues.
After the muffler is modified, I will get it painted and put it back on and just live with it.