STS Turbo They don't make a Vibe/Matrix specific kit, but they have universal kits available. I've read several articles, plus the website, plus seen it featured on different shows on the Power Block and if I were to turbo, this would DEFINITELY be how I go!!!
Turbo is more power and easier to make custom. Superchargers either need brackets and pulleys or custom made intake manifolds, etc that the average speed shop doesn't have the ability to manufacture. plus centrefugal superchargers that would be used in a custom application are really expensive. But supercharger kit is much easier to bolt up if it's made for your application than a turbo kit.