I'm looking to build a tuned pipe for my HS-50. I have killed all my brain cells trying to find the specs. for the m48 engine. What I need to find out specifically is the exhaust port angle, the transfer port angle, the exhaust port area (I might be able to find this out if I can ever find my mic.), and the aproximate exhaust gas temp. Nobody, and I mean nobody seems to have this info. I didn't want to leave all this up to you experts (again!!!) but I've run out of rope. Any help???