1.4l + turbo + supercharger = 170hp???
Seems like a waste of time to me man. You'll have equally as hard a time trying to just add(and be able to utilize) a larger turbo. You'd get better performance gains if you just invested your money into bypassing the t8 system to change the fuel curve and up the boost. But what do I know? If you're gonna add a supercharger, you might as well try and throw a small turbine under there too
Bottom line: it IS possible, but would cost waaayyyy too much money, and wouldn't even provide any real significant gains. You'd save a ton of money investing in a larger turbo and a stand alone engine management system if you're going to go through the trouble.