Which is quicker – a Porsche 911 997 Turbo S, or a BMW M5 CS? Well, it’s time to find out! We’ve got Mat in the Porsche, and he’s facing off against this range-topping M5 to see which is the king over the quarter-mile! So how do they compare? Starting with the Porsche, it’s packing a 3.8-litre twin-turbo flat-six that can put down 530hp & 700Nm of torque. It’s equipped with all-wheel drive, and it tips the scales at 1,585kg. If you’re looking to buy one of these today, it’ll cost you around £80,000. In comparison, the M5 CS costs MUCH more, starting at £141,000! What’s more, its 4.4-litre twin-turbo V8 can put down more power than the Porsche, producing 635hp & 750Nm. However, it’s got one key issue compared to the Porsche – it weighs in at 1,825kg!