The Jaguar's most powerful and fastest of all time is back on our pages today we offer the first official video of the XKR-S, the model presented by the manufacturer of the recent Geneva Motor Show in Coventry. Few numerical coordinates are sufficient to frame the potential of the coupe: 5.0 V8 volumetric its direct-injection delivers 550 hp and 680 Nm, taking the car to 100 per hour in 4.4 if allowing it to reach 300 km / h top speed .