Do you really think you're going to pull out 100 horses and infinite gas from nowhere with a metal rectangle that goes by the name "Big Balls"?
EDIT: I should make this post productive. If you want performance, get an exhaust, an intake, lower the weight on the car, get some performance tires, not sure if headers and/or a tune is available for our cars, but if there is do those and there ya go.
Ebay "chips", or any made, won't do anything for the car. They are generally just resistors made to look nice in a box but don't offer anything for performance. There is not much for performance for the malibu.