We tweak the ECU on this 2009 Chevy Cobalt SS and get some pretty impressive horsepower gain! Only at www.gmhightechperformance.com, the official site for GM High-Tech Performance Magazine.

The RPD can also apparently disable traction control, stability control, and engage Competition Mode for when you want to push the limits of you and your 2009 Cobalt SS. The Chevrolet Cobalt may ...

The Cobalt’s competitors include the Honda Civic, Ford Focus and Toyota Corolla. New for 2009The Chevrolet Cobalt gets variable valve timing on its 2.2-liter engine in an effort to improve mileage.