High-performance versions of the 3 Series and 4 Series that launched earlier this year, the new models feature an array of augmentations that make them stand out from their predecessors.
The naturally aspirated V8 engine has been swapped for a twin-turbocharged 3.0 litre inline-six engine, producing 425 horsepower, marginally better than the 4 litre V8.
According to BMW, the power being evenly spread over a broad rev range of 5,500rpm to 7,300rpm guarantees linear power delivery. The engine also produces a peak torque of 406 pound-feet that starts at 1850 rpm and continues all the way till 5,500rpm – a significant improvement on the M3 and M4 forerunners.
Both models can go from 0-62mph in 4.3 seconds (4.1s with the DCT gearbox) and reach top speeds of an electronically limited 155mph.
On the cars’ exteriors are stylishly designed noses with the front apron and wide air intakes intended to add downforce and retain stability at high speeds. Other notable features include low weight 18-inch forged wheels with mixed-size tires, whilst 19-inch wheels and tires are available as an option.
On the inside, the double-spoke M Sport leather steering wheel comes as standard, as do bucket-style M sports seats and the BMW Individual roof liner in Anthracite.
The BMW M3 and M4 will make their public debut at the next month’s Detroit Motor show and will go on sale by summer 2014.