The Mercedes specialist will also gladly upgrade the 5.5-liter twin-turbo V8 with its PowerXtra module to bump output up from 557 horsepower and 560 lb-ft of torque to 620 hp and 604 lb-ft. As a result, Brabus claims its modified GL63 can now reach 62 mph in 4.7 seconds and top out at an electronically-limited top speed of 174 mph. And of course there is a wide array of customization options for the interior as well, making this beast feel as special as it likely drives. - See more at:

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