I'd just keep the supercharger or buy something with a turbo on it already. There will be plenty of room to make power with the set up it has. Did you see the 272 hp Cobalt? WITH the supercharger, and WITHOUT major upgrades to the supercharger? If you think it's gonna be easier and worth it to take the supercharger off, and drop the cash on a turbo, that's your choice. The only reason that there isn't already upgrades for the car is the lack of supercharged cars of this type in circulation. There will be plenty of stuff coming out, I'm almost positive that GM will offer a new aftercooler and pulley for the car soon, I even found part numbers for the stuff, it's just not out quite yet.