Well since the pipe is a clamp on style it would be easy to cut any other pipe and make it fit. The Mop-Shop has some pipes with expansion chambers that are made for the Solo.
As far as porting, I have no idea what that means and I am not really sure what the reed block is either.(LOL)
Mine is also a 49cc 2speed. I was just guessing on what the 40 meant. Ok getting out the scanner now so I can upload the English manuals for the 40/2. And yes please try to find info on the intake you got so I can mod mine a little.