The six-cylinder turbo gets more power and torque, but the i4 carries over its all-electric powertrain. Sales figures provide clue as to why BMW is updating i4.
While the 2025 i4 M50 carries over its 536-hp all-electric powertrain , the combustion-powered 2025 4-Series models add 48-volt mild-hybrid technology for both the four-cylinder and six-cylinder variants.Changes inside the cabin are fairly significant, with a new instrument panel, center console, and steering wheel. Sales figures provide clues as to why BMW is updating the i4.
The four-cylinder benefits on the efficiency side from addition of the Miller cycle combustion process and redesigned intake ports and combustion chambers, but the horsepower and torque figures stay the same. Meanwhile, the six-cylinder in the M440i gets an extra 11 hp as boost from the auxiliary electric drive of the 48-volt starter generator. Changes inside the cabin are fairly significant, with a new instrument panel, center console, and steering wheel.
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