Many people here have said they're going to weld on a BiTurbo or some other pipe to their PA 50 II. (I think one of the Cutters was going to fabricate a Vespa pipe for their Hobbit????)
Some of them say they'll post pictures once it's done. This has never happened though.
But when I do it (or if I fail miserably) I'll post something.
It seems like it should work fine in my mind. And the pipe is cheap so you don't have to feel too bad if it doesn't work out.