Not sure which 2001 Toyota 4Runner 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 K&N air filters in all my vehicles and I get about 1 mpg in improved gas mileage. It is a cost effective alternative to conventional filters. Also,there is a noticeable gain in power" —John L from Greer, SC bought a K&N Air Filters for a 2001 Toyota 4Runner.
"I have three vehicles,all have K&N air filters. My Prius is the vehicle with the most amazing results. I average 60 mpg on trips,the average for the Prius is 48 mpg. I beleive it is because of the K$N air filter why my highway mileage is about 20% better than average. I have gotten as high as 72 mpg on trips. Its a great product by an AMERICAN CO." —Thomas W from Pittsburgh, PA bought a K&N Air Filters for a 2001 Toyota 4Runner, 3.4L V6.