During a private test day at Monza circuit I have filmed the track-only version of the McLaren 570S built to FIA GT4 standards. Like most GT4 race cars, the 570S GT4 is aligned with the production model on which it's based, including sharing the engine and transmission; in this case, a twin-turbocharged 3.8 liter V8 delivering 570 hp with a 7-speed dual-clutch transmission.