Hey Tan from what I have read here they are the same. I also have read that the Tower Hobbies muffler off their brand 45 is a tuned muffler of sorts. it is supposed to fit the TT motors and give a decent performance increase. They are also listed in the cataloge for less than 20.00$. I hope this helps. Check in the engine section here. There are lots of threads along this line. I hope this helps.

Mark Shuman