The GT3 will reportedly be the first of the pair to arrive, with Autocar claiming it will break cover at the Geneva Motor Show in early March. In that form, the 4.0-liter boxer engine will reportedly be tuned to at least 500 horsepower, and connected to either a seven-speed dual-clutch gearbox or a six-speed manual transmission.
The seemingly knowledgeable source claims Porsche discovered that the current 718 Cayman S can lap the Nürburgring as fast as the current GT4 when fitted with that car’s tires. Therefore, the only way to make the GT4 faster than its lesser, turbo-four-cylinder-powered siblings without forced induction is to drop in a huge naturally aspirated engine.
It was also confirmed that the forthcoming 911 GT2 RS is to be powered by a 650bhp twin-turbocharged engine, making it the most powerful 911-production car to come out of Weissach. Porsche Motorsport engineers had toyed with a 700bhp version of the engine, but cooling issues forced them to reduce the power output.
Clearly it won’t have the full 500bhp-plus provided to the new GT3, but expect an output of at least 430bhp, a clear 50bhp rise over the Cayman GT4 and more than enough to establish a clear performance margin to lesser, non-GT Cayman models.