It's the one you Porsche fanboys have been waiting for - a Porsche 911 Turbo S showdown! Mat's in 911 992 Turbo S, and he's going to find out just how different the performance is compared to the older 991 model. It won't surprise any of you that the newer model can put down more power. With a 3.7-litre flat-six twin-turbo at the rear, it's got the ability to produce 650hp and 800Nm! As for the 991? It's also packing a flat-six twin-turbo, but it can 'only' produce 580hp & 750Nm. But of course,