It doesn’t always have to be a Porsche 911. Since 2015, anyone wanting to drive a first-class German sport coupe has had an excellent alternative to the Zuffenhausen classic available in the form of the Mercedes-AMG GT series. The Nürburgring Nordschleife is considered to be the home of the AMG GT, especially the GT R top model. Like many manufacturers, the Mercedes tuning specialist RENNtech also has a development and testing center located right next to the legendary circuit. Now RENNtech has compiled a large tuning portfolio for the sports car to match these first-rate circumstances. The centerpiece is a broad range of ways to enhance performance. Depending on the model, 612 HP up to a fierce 825 HP are possible, as in the RENNtech AMG GT R R825 pictured here. The maximum torque rises to at least 730 Nm and up to 850 Nm in the highest expansion stage. The performance packages that enable these power increases are a software upgrade for the engine control unit, a downpipe with a...