Here at Carsportals.com we caught Jaguar testing the future XJR(Super V8) model in Laguna Beach California yesterday evening. As you see the car you will instantly notice the large fenders which point out to wider tires on 20″ rims used on this high performance sedan. Our sources state that the car will be using the Mercedes-Benz V8 compressor AMG tuned to 580hp. (another Image after the Jump)