The Rolls-Royce Cullinan is without a doubt the world’s most luxurious SUV, and as you well know, luxury and aftermarket parts nowadays tend to be two sides of the same coin.

We’ll let you decide whether or not Spofec’s take on the Cullinan is something worth writing home about, or rather a bit too over the top. In their defense, the tuner didn’t settle for just a widebody kit and massive wheels, as this British people hauler now produces 685 PS (675 HP).

The body kit is called Overdose, which is pretty appropriate. There’s a new front bumper that gives the Cullinan a more distinctive face, while also reducing front-axle lift at high speeds.

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Compared to the production model, the Overdose kit adds an extra 12 cm (4.72 inches) in width at the rear, which is pretty considerable. Meanwhile, the sweeping flares add 10 cm (3.94 inches) to the front end, making room for the large 10Jx24 SP2 wheels by Vossen, featuring a 10 twin-spoke design.

The tuner also made sure to modify the air suspension, thus lowering overall ride height by about 40 mm (1.57 inches) compared to the production car. The end result is said to be a more agile and safe-handling SUV.

Then there’s outright performance, where the Cullinan’s 6.7-liter twin-turbo V12 engine received a plug-and-play ECU module, special injection mapping and more boost pressure for a total output of 685 PS (676 HP) and 1,010 Nm (745 lb-ft) of torque. The result is a zero to 100 km/h (62 mph) acceleration time of just 4.9 seconds.

Other mods include a stainless sport exhaust system, sculpted rocker panels, custom diffuser and a subtle spoiler.

As for the interior, customers can choose between a wide variety of colors and a broad range of leather types.