The 2013 Mercedes-Benz G63/65 AMG gets a wide body kit and power boost from A.R.T. The twin-turbo V8 5.5-liter in the G63 AMG increased its output from 536 hp (400 kW) to 681 hp (508 kW). A.R.T. achieved this by reprogramming the ECU, putting in high-flow catalytic converters and additional cooling for the engine, fuel circuit and transmission.
The twin-turbo V12 6.0-liter in the G65 AMG could get the same upgrade, raising its power from 603 hp (450 kW) to 749 hp (558 kW). The torque has been electronically limited to 1,000 Nm (737 lb-ft). Aside from increase the power, A.R.T. also made a "streetline" wide body kit that consists of a new front bumper with built-in spoiler and extra air intakes, together with an aero engine hood in bi-color design with 19 air intakes.
In addition, it gets a stainless steel sport exhaust system with three end pipes on each side. The G-Class is built on monoART1 22x10 wheels covered with 295/35 R22 tires and has gotten a roof spoiler. It also gets bi-xenon headlamps with built-in LED DRLs and different interior customization options with materials such as leather, Alcantara, carbon and wood.