I just discovered this thread and it’s pretty entertaining to read. I’ve always wanted to attempt something like you were talking about. I even went as far as to buy a keychain turbo (not a supercharger but close enough) but it was never going to make boost so I gave up. I think this summer when I’m not so busy with school I might try to draw something up in cad. If you designed it right you could 3d print a turbine and make a centrifugal supercharger. Maybe I’ll try that on my magnum xl-52 four stroke