The McLaren 570s GT4 has the most in common with the road cars as it shares the same dash and center console found in the road car equivalent, along with very similar traction control and ABS. The BMW’s interior has a similar layout to the Aston Martin Vantage GT4 and Toyota Supra GT4. The interior has been replaced with a carbon dash and central control panel with a multi-function racing steering wheel. The 2018 BMW M4 GT4 car takes a lot of its interior design from its faster brothers, the M6 GT3 and M8 GTE. For example, the BMW M4 has the same wiring loom as the road car, and it is just the programming that is modified, but the Aston Martin GT4 has a race car specific wiring loom. The electronics you would expect to find in a GT4 differ from model to model. GT4 cars often have lower cornering speeds, due to having less aerodynamic grip than GT3 cars, and slightly less power, usually developing between 380-450 horsepower. However, they are significantly less adjustable in a GT4 car than their GT3 counterparts. The braking system is often carried over from a GT3 car to ensure consistent brake life, along with the same basic traction control and ABS. The major changes made for a car to compete in the GT4 category are adjustable dampers and revisions to the suspension geometry, electronics, cooling, and braking systems. GT4 cars are the closest relative to their road-going counterparts, which share the same engine, gearbox, and differential for reliability and simplicity purposes. GT4 cars are the entry-level to the professional racing world, often with their own series such as European or American GT4, or shared races with GT3 cars like British GT and the 24-Hour series.
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