I really like these vs21's. http://m.ebay.com/itm/331596894632
They are tiny, they work well on 600cc I just wonder how small of a motor would spool it. There is a company making a legit supercharger for 50cc Honda's I would just like a tiny turbo suitable for our bicycle size motors. I have a few pieces gathered up at the shop to build one but have not come up with realistic compressor wheel although I think I have a viable turbine wheel and housing. All seriousness aside you should attach that big turbo on the desk to the CG there is nothing better than a turbo bigger than the motor ha ha.