Ordinary paper filters are infamous for clogging up quickly. This chokes off air to your engine and unless you're constantly checking under the hood, you may not even notice it. Reusable Mazda CX-9 custom fit air filters solve this problem. As you look through the air filters featured among our CX-9 accessories, you'll find CX-9 air filters that can go up to 100,000 miles before they require cleaning. And, during all that time they send your engine the torrent of fresh, clean air it needs to give you maximum power, fuel economy and engine longevity.