So I finally decided to begin building my Cobalt SS/SC. My first step...an Injen CAI. So I get everything installed after having a pita of a time getting that bumper lining off. I decide to open the stock airbox to see what the filter looks like. The first thing I notice is the date on the bottom of the air filter. 11/05/05. WTF! This air filter has pretty much been in my car since is was built. All I can say is that's what you get when you buy a used car.