Just wanted to ask what intake filter other maxima owners are using instead of the generic K&N filter on the cattman CAI. Also, has anyone done warranty exchange for optima batteries? I have a yellow top for about a year and it died

hey wayne any optima dealer (person who sells optimas) should be able to take care of the swap for you. Interstate makes Optima so if you can find an interstate dealer that would work as well.

Most filter would fit. As long as it's design for a 3" piping. I would find the biggest possible filter. Open top would allow even more flow.