R2 Performance Package | W463 | G 55K | 560 HP / 596 LB-FT | 5.5L Supercharged V8 | M113R2 Performance Package for 463 G 55 AMG Kompressor. Includes ECU Upgrade, Crankshaft Pulley, Carbon Fiber Air Box, 82mm Throttle Body and High Flow Intercooler Pump. Up to 560HP and 596LB FT. Gains: +63HP & +80LB FT Performance package R2 takes performance to the next level and is a step up from our R1 tuning package. The R2 performance package includes the same components found in our R1 package with the addition of a full carbon fiber airbox, 82 mm