i have a shindaiwa 231t and as everyone knows are big pieces of crap. i hear all the time how people take mufflers off old 230s and put them on the 231s. i recently saw where j. thomas has both mufflers for sale. my question is, are the the same muffler for sale or is j. thomas allowed to sell the old style mufflers? i was thinking about getting one but i don't want to if its the same piece of crap muffler i already have. thanks in advance. randy.