Review on Enhanced Performance K&N Cold Air Intake Kit: Ensured Horsepower Boost: Compatible with 2009-2013 MAZDA (6) - Model 69-6028TTK by Jake Powell

This K&N was added to the 2009 Mazda 6i. Fits perfectly. I added some blue threadlock to the screw that connects the black metal box to the frame. (The small screw that sits just below the cone filter). The screw came loose when originally installed and made a vibrating noise (like the muffler was in the front of the car). After I added the screw lock and re-tightened the screw, the noise was gone. You'll now hear a little extra "sucking noise" that's common with this type of filter, but it sounds a lot better now. I have seen a 2mpg gain after 2 months of tracking.