Summary: K&N has designed a performance air intake system for the 2010 Toyota 4Runner and FJ Cruiser 4.0L. K&N dynamometer tests show a 13.55 horsepower gain at 5000 RPM with use of this K&N air intake modification. K&N tests multiple vehicles for each air intake system it makes to ensure a consistent horsepower and torque gain. This video demonstrates the steps needed to install a power gaining K&N air intake into 2010 Toyota 4Runner and FJ Cruiser with the 4.0L engine.
