DUBAI: Porsche is launching another powerful addition to its SUV Coupé range: the Cayenne S Coupé. The model is available for order from today, with first units expected to reach the market in October. The 2.9-litre V6 engine featuring twin-turbocharging and developing 440 hp (324 kW) is at the heart of the new four-door sports car. The maximum torque of …