In "Hot Metal", Jeremy Clarkson tells us how everything is slowing down. But is it the same for today's cars? That means the 200-mile-per-hour Jaguar XJ220 taking on a Pagani Zonda. It means pitting a Mercedes McLaren SLR against a Porsche Carrera GT. And it means lining up a Ford GT with the original GT40. The Aston Martin DB9 is here too, taking on the old V8 Vantage warhorses, and... see more