Not sure which 2004 Mercury Mountaineer Air Filters - Custom Fit is right for you? We have over 14143 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"I have used K&N Filters now for a number os years. I find them to perform very well,and as good as advertised." —Eugene V. Z from Gloucester, VA bought a K&N Air Filters for a 2004 Mercury Mountaineer.