The Porsche 911 Turbo S Cabriolet is the fastest way to travel in a soft-top 911, at least as far as factory models are concerned. The range-topping, 3.8 litre twin-turbo, flat-six cranks out 580 hp and 750 Nm of torque. German tuner TechArt adds considerably more from the same engine architecture, and manages to squeeze 720 hp and 920 Nm of torque from the powerplant.
Changes made to the engine include an ECU kit, sport air intake filter, TechArt turbochargers with variable turbine geometry and a sports exhaust system with stepless valve adjustment. Additionally, the transmission also gets TechArt gearbox management calibration.
On the chassis side, the GTStreet R rolls on a choice of either 20-inch or 21-inch wheels and tyres. TechArt also offers its VarioPlus coilver suspension kit for pairing with Porsche’s PDDC damper control setup, or the TechArt Noselift front axle lift kit for an additional 60 mm of ground clearance at the front.
The GTStreet R exterior is more aggressive all around, with a deeper front bumper and active front spoiler lip reshaping the airflow around the car. Wheelarch extensions further broaden the already wide 911 variant – with front wheelarch vents fashioned after those on the 911 GT3 RS – while large air scoops reside just ahead of the rear wheels.
Around the back, a huge rear wing sits atop the decklid, while a new bumper sports deeper sculpting, with cut-outs for the more centrally-located exhausts. These culminate in performance figures of 0-100 km/h in 2.7 seconds, 0-200 km/h in 8.5 seconds, 0-300 km/h in 23.3 seconds, onwards to a top speed of 340 km/h.