My advice Flushcut is silver solder a 1 1/2" long [1" inside muffler] X 9/16" thin wall steel tubing into the bottom of your 338XPT's muffler, cut a hole in the plastic cover for clearance. Your 338 will be a totaly different saw. Try some .325 chisel on it too.
I love my MS200 but I love the top handle of the 338 for its excellent grip, especially when using it one handed. I know that one handed is a no no but we all do it if we can.