Both high-performance SUVs are powered by a V8 5.5-liter bi-turbo engine which has received gold heat reflection insulation, two bespoke turbos with larger compressor units and a free-low metal catalyst system with 75mm downpipes. Brabus also installed a stainless steel sport exhaust with controlled butterfly valve and they also remapped injection and ignition systems.
As a result, the GL 63 AMG is now capable of churning 700 HP (515 kW) at 5,300 rpm which makes it 143 HP (105 kW) more powerful than the standard model. The ML 63 AMG produces the same 700 HP, representing an increase of up to 175 HP (129 kW). Both vehicles come with an electronically-limited torque of 960 Nm (708 lb-ft) available from 2,000 rpm.
The engine is mated to an AMG SPEEDSHIFT PLUS 7G-TRONIC which allows the GL 63 AMG to hit 62 mph (100 km/h) in 4.6 seconds, while the ML 63 AMG will do it 0.2 seconds faster thanks to its lower weight. In order to protect the tires, Brabus has limited top speed of both models to 186 mph (300 km/h).
Aside from the reworked power unit, the cars come with a widebody kit with larger front and rear spoilers, 22-inch alloy wheels available in five different styles, along with several other exterior enhancements. There's also a control module for the AIRMATIC air suspension which can bring the cars closer to the road, thus lowering the center of gravity and improving handling.
Complete details are available in the press release area.