The GT2 RS's reputation as the most powerful street-legal car is as monstrous as this comprehensive guide. Suffice to say, this supercar has been built with the best Porsche has to offer. It's not bragging, it's just facts. There is no doubt that the new GT2 RS is the pinnacle of the 911 in terms of performance. It is simply the fastest 911 in history, and that’s a fact. It is the quickest production car to lap the Nürburgring Nordschleife. It is the most powerful 911 ever made.