It's been nearly a year since the 2019 Mercedes-AMG G63 arrived with monumental performance. Under the hood is a 4.0-liter twin-turbo V8 that generates a substantial 577 horsepower and a 626 lb-ft of torque. Clearly, this isn't enough for some buyers, because AMG is considering developing an even more powerful G63 S. If it gets the green light, the G63 S could potentially pack over 600 hp since AMG S models like the C63 S and E63 S typically have around 30-40 more horses under the hood compared to standard models.

If you can't wait for the super SUV to arrive, UK tuner Urban Automotive has turned the current G63 into a menacing 700-hp monster, which is 123 more horses the standard G63. While the tuner hasn't said how this upgrade affects the performance, the standard G63 accelerates from 0-62 mph in just 4.5 seconds, which is nearly a second faster than the outgoing model. Top speed is limited to 137 mph or 149 mph with the optional driver's package.

To complement the increased performance, Urban Automotive's take on the G63 is clad in copious amounts of carbon fiber. Everything from the bumpers to the rear spoiler is made from the lightweight material, as are the side sills and beefier wheel arches that extend the width by nearly two inches compared to the standard version. A spare wheel cover and the lower diffuser round off the extensive carbon fiber package, giving the G63 a meaner look.

Elsewhere, the modified SUV gains mounted LED lights and a new set of 23-inch wheels and a custom suspension setup. The sound delivered by the twin-turbo 4.0-liter V8 can also be adjusted thanks to the new exhaust system with switchable valves.