R1 Performance Package for Range Rover 5.0L V8 SuperchargedR1 Performance Package for the Range Rover V8 Supercharged 5. 0L Engine comes with an ECU Upgrade and a Larger Crankshaft Pulley. The Maximum Performance Ouput is up to 558 HP + 571 TQ. Gains: +50 HP 110 LB FT RENNtech has been at the forefront of ECU tuning since electronic engine management began to be utilized in vehicles during the mid 1980's. Our vast experience, countless hours of in house research, development, and exhaustive testing; ensure