yes that's the muffler, I talked to a guy at J'tec when I ordered the one I have and he said that you start getting some noice reduction when the volume of the muffler is 3-1/2 x the engine displacement. I actually ordered the DA muffler for my DL. They are both interchangeable (biggest reason I bought the DL). I had 6 flights on mine with the new muffler when the muffler vibrated off and fell into the middle of a corn field. No way to find it until they cut the corn. That was a 135 dollar hit to my wallet.