The redesigned 2021 BMW 4 Series shares most components with the 3 Series sedan, but they are packaged in a sleeker two-door coupe form. Two turbocharged engines are available: a 255-hp, 2.0-liter four-cylinder and a punchy 382-hp, 3.0-liter six-cylinder that uses a 48-volt mild-hybrid setup to support accessories without hurting fuel consumption. The eight-speed automatic is smooth and responsive. Rear- and all-wheel drive are available. We found the 4 to be agile and fun to drive yet refined and luxurious. The iDrive infotainment system is quick and capable but takes some getting used to. FCW, AEB with pedestrian detection, BSW, and rear cross traffic warning are all standard. ACC and LCA are optional. The infotainment system was updated in 2024 with a larger, curved display and touchscreen-based climate controls. A 2025 refresh brought styling changes and an infotainment update to iDrive 8.5.