I'm looking for a cold air intake as well. I may go for the K&N 57 series. I have a Magnaflow header. I switched the O2 sensor to Bosch, but probably didn't need it. BE sure to unplug the battery. My engine light kept coming on for months until the computer reset the new O2 sensor. I'll Probably intal Magnaflow Catback soon as well. For fuel economy, but also for preventative maintainance. It's stainless steel. I recommend Bosch Platinum four prong spark plugs. They may cost about $8.00 a piece, but they last 100,000 miles, worth it! All this should improve fuel economy. Also change your batery every four years and keep the terminals clean.