The 4 Series coupe and cabriolet are closely related to the 3 Series sedan. Under the hood, the main change for 2025 is the addition of a 48V starter-generator easing the burden on the turbocharged 2.0-litre four-cylinder engine. Mild was already applied on the turbocharged 3.0-litre six-cylinder, which gets a slight boost to 386 horsepower. New colours and features are part of the mix, too. At the top of the lineup, the M4 Competition models now produce 523 horsepower.