Guys, I highly recommend the J'Tec radiowave inverted muffler. They have a nice sized can on them and a heat treated finish. They are top notch and a little expensive, but they will hold up well and last you a lifetime. They are nice and quiet compared to the stock exhaust, which isnt a muffler its a piece of foil shaped in a tiny rectangle. I have some on my DLE 30 and my 20 and you won't regret buying them. I'm sure no one wants to be a contributor to losing not only your hearing but your flying field to save $80 because the DLE is too cheap to provide one. Kudos to OS for including a good muffler in the new 33!