The Mercedes-Benz ML63 AMG is the latest iteration of the first SUV to bring supercar-like performance to a segment more typically associated with soccer mums. BMW鈥檚 M division only started placing its famous capital letter on the brand鈥檚 softroaders in recent years (X5 M and X6 M), and Audi has only just introduced its first sporty SUV, the SQ5. AMG, however, started tuning SUVs back in 1999, with the arrival of the ML55 AMG. Based on the first-generation Mercedes-Benz M-Class, the formidable ML55 packed a 255kW 5.5-litre V8 by AMG plus a host of performance features and modified bodywork. The ML55 AMG could accelerate from 0-100km/h in 6.8 seconds and had a top speed of 235km/h - then unprecedented figures in the SUV world. It could accelerate from 0-100km/h in 5.0 seconds and was the most powerful naturally aspirated SUV in the world. It also proved more popular than its predecessor with more than 13,000 sold during its lifecycle. Mercedes-Benz decided to continue with the same ML63 AMG nameplate with the third and latest generation ML63, despite reducing engine displacement to 5.5 litres. It develops slightly more power but significantly more torque thanks to a pair of turbochargers.

In standard guise, the Mercedes-Benz ML63 AMG bi-turbo powerplant generates 386kW of power and 700 Newton metres of torque from its 5.5-litre V8. But our test car was armed with the optional AMG Performance Package, which raises those numbers to 410kW and 760Nm by increasing the boost pressure from 1.0 to 1.3 bar. Looking more like a full-size Hot Wheels creation than a family-friendly SUV, the latest-generation ML63 AMG is also blisteringly quick. It鈥檒l cover a 0-100km/h sprint in 4.7 seconds (with the AMG Performance package), or about the same time it takes a BMW M3 Coupe to cover the same ground. It鈥檚 phenomenal performance for what is a sizeable five-seat SUV weighing 2345 kilograms. What sets the Mercedes-Benz ML63 AMG apart from its less powerful siblings are the conspicuous quad exhaust tips and massive 21-inch alloy wheels wrapped in equally large 295/35-series tyres at all four corners. There鈥檚 plenty of beefed-up bodywork on the ML63, too, with deeper front and rear aprons and AMG-specific side sill panels. The lower front splitter is especially wide to accommodate the specialised wheel and tyre package.

Hit the start button and there鈥檚 no mistaking the ML63鈥檚 demonic V8 rumble that sounds like a main battle tank at idle. Leave the ML63 AMG in 鈥楧rive鈥?and 鈥楥omfort鈥?suspension mode, though, and it can be a docile beast around town. There鈥檚 even a switchable, unobtrusive engine stop-start system to help save fuel. And every litre will count, because you can expect high fuel running costs for this mighty Merc. The average Mercedes-Benz ML63 AMG buyer is unlikely to flinch at such figures. Most, in fact, are likely to dial up the sport or manual mode along with the firmest suspension setting - and floor it. It鈥檚 then that you will fully appreciate why anyone would want to pay the sizeable premium for an AMG SUV. The whistling effect of the twin-turbochargers spooling up is immediate, but it鈥檚 quickly overridden by the ferocious, grin-inducing bark at each and every upshift from the seven-speed automatic.

It鈥檚 not as quick-shifting as a dual-clutch transmission, but the automatic double-declutching on the downshift (in the fastest-shifting sport or manual modes) combined with the seamless shifts is a major plus. Mercedes says the torque converter auto is also better for towing. It might weigh close to two and a half-tonnes, but that doesn鈥檛 mean the ML63鈥檚 handling is compromised. Even in the 鈥榗ontrolled efficiency鈥?mode - the least performance oriented setting - the ML63 AMG can capably carry huge speed through bends. Its cornering abilities are helped by an arsenal of body-roll-cancelling technology to keep the ML63 bolt upright. Equipped with AMG-tuned underpinnings with a sophisticated air suspension system, adaptive damping and Active Curve System, the ML63 employs active anti-roll bars on the front and rear axles to effectively eliminate body lean. It鈥檚 also an exceptionally well-balanced chassis that never feels overcooked no matter how hard you push, supplemented by all-wheel-drive traction and plenty of grip from the Continental rubber.