Ive got the G3200 and im working on turboing it. The chinese gt15 clone turbo will bolt right up to the stock exhaust manifold with very little modification
The GT15 is probably going to be a little big on that 10hp 399cc 2 cylinder. I tried to run a GT15 with .42AR on a 3 cylinder 750cc and it was way to big. Just my experience yours may be different.