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More grunt than a Lamborghini Urus? The 2022 Aston Martin DBX707 debuts as the world's most powerful luxury SUV

Subtle styling tweaks over the standard DBX include a redesigned grille and new DRL signature.

Aston Martin has unleashed a beastly new version of its DBX SUV that it claims is a world beater.

Dubbed the DBX707, the moniker references the power in metric horsepower that comes from its Mercedes-AMG-sourced twin-turbocharged V8 engine.

That figure translates to 520kW of power and it pumps out a gargantuan 900Nm of torque. This is a 115kW/200Nm increase over the standard DBX.

None of its high-end rivals can match these figures. The Mercedes-AMG GLE63 S and GLS63 S, which both share a version of the same V8 engine, deliver 450kW/850Nm.

Others including the Porsche Cayenne Turbo GT (471kW/850Nm), Audi RS Q8 (441kW/800Nm), Bentley Bentayga Speed (467kW/900Nm), Rolls-Royce Cullinan V12 Black Badge (441kW/900Nm) and even the Lamborghini Urus (478kW/850Nm) lag behind the Aston.

Australian deliveries for the DBX707 kick off in quarter two this year and pricing is set at $428,400 before on-road costs, about $72,000 more than the regular DBX.

It undercuts the Bentayga Speed ($491,000) and Cullinan (from $659,000) but it's pricier than the Urus ($391,698) and the Cayenne ($336,100). For the same money as the DBX707 you could buy two Audi RS Q8s ($213,900).

The British performance car brand says the DBX707 can dash from 0-100km/h in approximately 3.3 seconds (that’s the 0-62mph time), which is a shade quicker than the Urus (3.6s) and the Bentayga Speed (3.9s).

To get more power and torque out of the 4.0-litre V8, Aston Martin engineers gave it a bespoke calibration and fitted it with ball bearing turbochargers. The DBX707 drives all four wheels via a new nine-speed wet clutch automatic transmission designed to help manage the bump in torque.

A new version of the DBX’s electronic limited slip differential is also designed to help handle the additional torque. This has also aided cornering ability, according to Aston.

The new super SUV has a dedicated chassis tune and uses the same air suspension as the standard DBX. Tweaks to the damper settings and other suspension upgrades ensure greater body control and a retuned power steering system makes for sharper steering response.

It features a Race Start setting as part of the GT Sport and Sport+ drive modes for even more brutal acceleration.

Styling tweaks include a larger grille and new daytime running light design, new front splitter, tweaked air intakes and brake cooling ducts, as well as satin chrome and gloss black touches. At the rear there’s a new spoiler on the roof, a bigger rear diffuser and quad exhausts.

It rides on 22-inch wheels but 23-inch alloy hoops are optional.

Inside the DBX707 has a lower console than the DBX, new drive mode switches, sports seats and a choice of interior themes and trims.

CarsGuide has contacted Aston Martin Australia to find out if the DBX707 will be available in Australia, and to confirm pricing.