The supercharged 5.4-litre V8 was replaced by the new 5.5-litre biturbo V8 for 2012 for better fuel consumption and lower emission. AMG made some more changes to the exterior as to give G 63 AMG more "brawl" appearance: single horizontal fin with twin chrome edges in the middle of radiator grille with more prominent three-point star ornament in the middle; new light-alloy wheel design; three enlarged airflow inlets on both sides and in middle of front bumper; vertical chrome stripes cover the small bumper guards; exterior rear-view mirrors are same as in GL-Class and ML-Class. The mechanical upgrade was AMG sports exhaust system with high-gloss chrome inserts, larger AMG high performance brakes with six-piston fixed calipers for front brakes from ML 63 AMG, and revised suspension and damper settings for more dynamic handling characteristics.