Toyota 4Runner Air Intake and Exhaust Guides
Upgrading your 4Runner's air intake and exhaust system is easy with our guides and how-to's to walk you through it. Remedy your air intake and exhaust problems with our repair how-to's. With our help, it'll take more than an exhaust leak or a malfunctioning mass airflow sensor to keep your 4Runner down.
How to Replace Air Filter
Why does your engine even need an air filter? Find out here.