Behold Porsche tuner 9ff’s latest creation – the Speed9. Based on the Porsche 997 Turbo Cabriolet, the Speed9 rocks some serious visual cues and – get this – 650 horsepower from a twin-turbo motor. How’d they do it? As you might expect, the additional turbo has something to do with all that extra muscle, but a free-flow exhaust and reworked ECU contributes to the final dyno figure, too. Adjustable coilovers, six-piston brakes and 15 inch rotors help round out the car. Inside you get a custom interior, including unique seats and a sport steering wheel. Check the gallery for more shots. [Source: WCF]