Unleash the true potential of your 1GR-FE 4.0L V6 with the Magnuson Roller Rocker Supercharger System! Magnuson is proud to announce the 2010-Present 4Runner and 2010-2014 FJ Cruiser Supercharger System is available. At around 6 PSI the kit gives customers 30% increase over stock on horsepower, and a 28% increase in torque. The supercharger system is a positive displacement, roots style kit, utilizing Eaton's lightweight TVS rotors. Cast and assembled as a single, OEM-style-manifold and rotating group housing, the unit is quiet, compact, attractive, easy to install, and requires little to no extra maintenance.