The most powerful diesel SUV in the world has just got even more potent and stealthy thanks to a new tuning program for the Audi Q7 V12 TDI from Fostla.

In factory trim, the Q7’s 6.0-liter twin-turbocharged V12 diesel engine churns out 493hp (500PS) and 1,000Nm (738 lb-ft) of torque for a zero to 100km/h (62mph) sprint time of 5.5 seconds and a limited top speed of 250km/h (155mph), according to the manufacturer.

Fostla’s package includes a €6,000 (US$7,700) power kit that brings output to 592hp (600PS) and peak torque to 1,150Nm (848 lb-ft).

The German company then proceeds to the design applying a matte black foil wrap on the body while also tinting the side and rear windows and the lights. The styling package is priced at €3,500 (US$4,500).

For the final touch, Fostla adds 23-inch powder-coated wheels from Mansory shod in high-performance tires size 315/25R 23.

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