Use this K&N air filter whenever you're driving your 2005 - 2010 Chevy Cobalt or 2007 - 2009 Pontiac G5. Whether you're commuting daily or going on a long road trip, it'll keep your engine running smoothly. It's perfect for car enthusiasts who want to enhance their vehicle's performance and save money in the long run. The filter is designed to fit right into your factory air box, no special sizing or complex measurements needed.