RE: supercharger
OS and others have been making 4-stroke car and truck engines for quite a few years. You are right they will be much slower then the 2 strokes as 2 strokes are the cheapest way to make HP. Just hope they do not do them like they are on motor cross bikes. Will not be much longer before 2 cycle race bikes are outlawed do to pollution. They outlawed 2 stokes on road use in the US in the seventies.