Thack82 you have warned him that developing two-stroke exhaust systems is very time consuming and expensive.  Your friend sounds very determined.  I had similar warnings and discouragement 40 years ago from engine builders and friends. 

It is this type of determination that made me find out the pipe formulas just generates a crude starting point. I have yet to find any software that even comes close to designing the optimum pipe with out a lot of testing and refinement.   It was this type of determination that gave me the desire to become an engineer.  It was this type of determination that makes you spend 80 plus hours a week testing, learning, building a lot of test pipes that were dismal failures. It is this type of determination that makes you keep buying new cylinders because you ruined cylinders trying new porting ideas.  I would let him pursue his passion.  He may eventually gain enough experience to be able to build engine/pipe combinations that satisfies his goals.