Not sure which 1981 Ford F-100 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 4 K&N filters that I have installed in various vehicles. BMW Motorcycle, 73 Ford Pinto, 85 Ford EXP and 00 Mustang. Each vehicle I noticed improved performance most notably was the Pinto. I had installed a hipo cam, header with larger exhaust and a dual port intake. The car really responded when I installed the new filter and housing." —George E from Cheyenne, WY bought a K&N Air Filters for a 1981 Ford F-100, 4.9L 6-cyl. engine.