Moving the RSR into the next generation, the geniuses at Porsche’s Weissach facility boast that the car is 95-percent new all around. For starters, engineers overhauled the potent naturally-aspirated flat-six engine to displace 4.2-liters with output rated at around 515 horsepower.
But more so, Porsche claims it’s the largest boxer engine to ever be fitted to a Porsche 911. It’s mated to a beefed up sequential six-speed constant-mesh transmission, which is said to shift faster thanks to an improved clutch and be more efficient from better gearing. The exhaust for the engine is also repositioned to exit at the sides in front of the rear wheels rather than at the back. This also saves weight and improves aerodynamics.