A Turbocharged version of the 993 was launched in 1995 and became the first standard production Porsche with twin turbochargers and the first 911 Turbo to be equipped with permanent all-wheel-drive (the homologated GT2 version based on the Turbo retained RWD). The similarity in specification and in performance levels inspired several comparison road tests with the 959. The 3.6 L twin-turbocharged M64/60 engine is rated at 408 PS (300 kW; 402 hp)). The performance was outstanding at the time, as 0 to 97 km/h (60 mph) has been measured at 3.2 seconds, and the braking was even more impressive in 2.3 seconds from the same speed. The car’s top speed was measured at 322 km/h (200 mph) at 7,000 rpm. The differences were striking – the 959 had a much smaller engine, sequential turbocharging and a computer-controlled all wheel drive system. The 993 turbo had parallel turbochargers, 3.6 litres of displacement, and a viscous coupling for the center differential in the AWD drivetrain. The turbo was only produced in 1996 and 1997 model years. The main difference was that the ECU in the 1996 model year could not be flashed for an upgrade, while the 1997 could. Additionally, the 1996 year had Porsche crested centre caps on the wheels, while the 1997 had turbo inscribed. Another difference is the motion sensor and map lights above the interior rear view mirror on the 1997 while the 1996 had no such devices.
In 1997, Porsche introduced a limited run of 183 units of the Sport version of the 993 turbo dubbed the turbo S. With 24 PS (18 kW; 24 hp) over the regular Turbo’s 408 PS (300 kW; 402 hp), features include a scoop on the side right behind the doors for engine cooling and vents on the whale tail rear spoiler. Aside from an upgraded ECU mapping, a centre oil cooler behind the centre air intake at the front bumper was added.
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