Not sure which 2004 Cadillac CTS 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 had heard the claims but was skeptical. I am now convinced. I put the filter in my 2007 Cadillac STS - V6. Installation was easy. It replaoes the OEM filter perfectly.
After 2 weeks of use fuel economy increased by a solid 1 mpg. The engine seems a bit stronger and throttle response is crisp. Based on the results, this filter is a real bargain. It will pay for itself in a few months of use. Highly recommended." —Edward V from Herndon, VA bought a K&N Air Filters for a 2004 Cadillac CTS.