The science behind M xDrive is both sophisticated and proven, using an electronically controlled multi-plate clutch in the transfer case to split power between the front and rear axles as needed. In normal driving conditions, the M2 still sends power exclusively to the rear wheels, staying true to its rear-wheel DNA. Only when the rear wheels lose traction does the system bring the fronts into play. Working alongside the Active M Differential, which allocates power between the rear wheels, the setup is aimed at retaining that signature M driving experience, with just an extra bit of confidence for the driver.
The M2 with M xDrive sprints from 0 to 60 mph in 3.6 seconds, a full 0.3 seconds quicker than the rear-wheel drive model. Using the one-foot rollout method brings that down to 3.3 seconds. Top speed is limited to 155 mph from the factory, though opting for the M Driver's Package raises that to 177 mph. The same 473-horsepower inline-six with BMW M TwinPower Turbo carries over to the xDrive model, equipped with an 8-speed dual-clutch transmission.
For those who still want the full rear-wheel drive experience, BMW has kept that option available with the M2. Through the M Setup menu, drivers can select 2WD mode with DSC fully deactivated, sending all torque to the rear wheels only. It’s something that recognizes the M2's core audience while still opening the car up to a demographic of drivers who want the M2 experience across all four seasons in conditions where rear-wheel drive cars are often tucked away for winter months.

Source: BMW