Review on K&N Cold Air Intake Kit for Toyota 4Runner V6 4.0L (2010-2019) - High Performance, Boost Horsepower: Model 63-9034 by Stephen Thomas

The second unit I have bought and installed. Both gave me the results described. I got this for my 4 runner when I was going to tow a fairly heavy trailer for 1200 miles with my Can Am Maverick and knew it was going to need some help in the mountains. It helped as I had hoped. Most of the time I was able to maintain a steady speed of 70 mph. Of course there will be a downshift, but I expected that. Towing gas mileage was 14-15mpg, while I usually get 20-21 on road trips. As far as I can tell I can get another MPG on the Autobahn. sound is not a problem. Yes, of course there is a strong growl under hard acceleration and only a slight growl under light acceleration. Imperceptible at cruising speed. In my opinion it is worth its price. Oh and the installation is a bit tricky, just pay very close attention to the instructions and very close to the circuitry, if you do this it shouldn't be a problem at all.