UPDATE!
Good news and bad news.
Good news: IT DOESN'T KNOCK!!!!!!!
Bad news: The muffler I planned on using served as a home for wayward mice! The sumbitch is clogged! Any idea how to solve this dilemma? I was thinking of tossing the muffler in a fire, and that that would burn the stuff out. I could also take the muffler off of my old 230E and put it on there, but I'd still need to buy a new muffler. Anyone know of a nice quiet aftermarket muffler I could put on mine?