I think what your looking for is beyond any production pipe. You may need to bust out the two stroke hand book and and do some mathssss. Then see if you can get someone to build what you want.
I am with Derek on the pipe situation. My Gila with a BK100 rips hard all over but leaves something to be desired up top. The Gila I have with a Motomatic N8P revs out super high. I need to put a tach on there and see where it revs out at. If you could get your hands on one I would try that or maybe a Simo just because?
It would be cool to see someone hit 80 on a non variated bike.