I replaced the air filter on a 2008 Pontiac Vibe. 2002-2008 all have the same air box and air filter design, so this video would apply to these years of Vibes and Matrix's. There are a number of good air filters on the market that you could use; I used a FRAM filter, part number CA9482.

From the FRAM Web site:

*A clean air filter helps to keep damaging particles from entering your engine and causing increased engine wear. Dirty air filters restrict air flow which can contribute to decreased acceleration, horsepower, and reduced overall performance. Experts at FRAM engineering laboratories recommend changing every 12,000 miles.

*Most dirt in your engine enters through your air filter, so install a clean air filter every 12,000 miles. Follow recommended change intervals as noted in your vehicle's owners manual.

*A new air filter can increase airflow horsepower, and improve overall engine performance.