Tuned 350km/h Porsche 911 Turbo S slams down 950Nm

German tuner TechArt has taken the wraps off its latest creation, the GTstreet R, which takes the latest 992-series Porsche 911 Turbo S flagship and injects more power, more torque, some extra eye candy and carbon-fibre wheels just for good measure.

Some may say the Porsche 911 Turbo S is already so good it can’t be improved, and maybe they’re right, but German tuners love getting their hands dirty and there’s no doubting the GTstreet R’s extra pace.

The standard vehicle’s twin-turbo 3.7-litre (3745cc) horizontally-opposed six-cylinder engine grinds out a handy 478kW or power and no less than 800Nm of torque.

But TechArt has extracted an extra 110kW and 150Nm, taking total outputs of the turbo boxer six to an astonishing 588kW/950Nm, thanks to a pair of bigger new turbos, revised software and a hand-welded, stainless steel twin exhaust system with valve control system for when a stealthy approach is required.

No 0-100km/h acceleration figure is stated (Porsche lists 2.7 seconds for the standard Turbo S), but top speed is claimed to increase from 330km/h to 350km/h, putting the GTstreet R firmly in supercar territory.

The TechArt-fettled Porsche 911 Turbo S can be upgraded with two different suspension packages, including the top-spec adjustable coilover kit that lowers the car a further 15 to 25mm closer to the road.

Several exterior elements have been replaced to improve downforce. TechArt claims the new carbon-fibre aero bodykit generates downforce four times greater than the standard Turbo S, which retains its active aero elements.

The exterior can be customised with mono-tone or two-tone paint schemes and a gloss surfacing can also be applied.

Even the cabin can be tizzied up with loads more carbon, Alcantara, leather and ‘heritage fabrics’. Like many of its peers, TechArt can create an interior tailored to customer desires.

Limited to just 87 vehicles, celebrating the year TechArt was conceived (1987), the GTstreet R upgrade is priced from 73,000 Euros (around $A115,000) on top of the price of the regular Porsche 911 Turbo S, which is already a $500,000 proposition in Australia including on-road costs.