Let me save you the time, hassle, flame wars (that I'll admittedly be participating in), excitement, and let down of any possible future turbo or supercharger: There is none, and never will be a viable option for any sort of forced induction on our cars, unless you have enough money to buy another car - then, and only then - will you be able to afford a forced induction kit for this vehicle. And, assuming you have that type of money, you wouldn't have been here in this first place.
So no, there is no future for you with a G6 and a turbo or supercharger.
There's only one company who has a kit that might work on our vehicle, and its very specific to a year/model of the G6, and two, our transmissions just cannot handle the added power, and finally there is no interest in the market for our cars, and so no-one really supports them except for an elite few which can be found on these forums who are G6 fans as well.