Which is better for a Pontiac G5, turbo or supercharger?

[RenegadeRenji]

I have an 07 Pontiac G5 that I'm working on. I have a magnaflow cat-back with flowmaster 40-series muffler, and K&N cold air intake.I'm looking to add an assload of HP onto my load. So which would add the most horsepower? Also are there any recomendations for a specific one? I'm sort of fond of Greddy and Apexi.

 

[OTownGraphics]

I know this isn't what you asked, but dollar for dollar, I would recommend a nitrous kit instead. Power when you want it, fuel economy when you don't. Just my .02.