Not sure which 2003 Toyota 4Runner Air Filters are right for you? We have over 14810 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 a 2003 4Runner V-8 and with a regular air filter my average fuel economy used to be about 15.9 mpg. After I switched to K&N filter that figure went up to ~17.4 mpg - roughly 1.5 mpg improvement. So far - it looks like an excellent purchase. The true test will be to see how easy it is to clean it but I've got another 49,000+ miles until then..." —Robert E from North Bend, WA bought a K&N Air Filters for a 2003 Toyota 4Runner, 4.7L V8.