Detroit LIVE: BMW X4 M40i

The new range topper can sprint to 60 mph in just 4.7 seconds.

BMW has officially revealed the X4 M40i, a new top package boasting M Performance tuning and styling.

As detailed in recent leaks, the M40i introduces a new TwinPower turbocharged 3.0-liter inline-six engine with 355 horsepower between 5,800-6,000 rpm and a maximum torque output of 343 lb-ft. An eight-speed paddle-shifted Steptronic transmission is the only option, bringing launch control and M Performance tuning of the gear shift patterns.

The powerplant has been adapted from the straight-six in the previous top trim level, the X4 35i, with an upgraded crankshaft, pistons, bearings and air intake to better handle the additional boost. A new exhaust system features directs flow to two tailpipes with black-chrome tips, with active valve control and M Performance resonator tuning for a sportier and more powerful sound.

BMW claims the M Performance mill can launch the X4 to 60 mph in just 4.7 seconds, slashing a half second from the benchmark set by the 35i. Top speed is electronically capped at 150 mph.

Engineers have increased camber on the front axle and strengthened the wishbones for increased steering response and feedback. Stiffer springs and reinforced stabilizers on the front and rear axles further reduce roll and improve driving dynamics, while the electronically-controlled dampers and variable steering system have been specially tuned by the company's M division.

Other performance-focused upgrades include more rear bias for the xDrive all-wheel-drive system, bigger front brake discs and grabbier pads, along with Michelin Pilot Super Sport tires mated to optional 20-inch double-spoke staggered wheels.

Designers also worked to give the M40i a more aggressive appearance, thanks to Ferric Gray metallic accents, larger air intakes and a new rear diffuser, among other tweaks.

Potential buyers will have a chance to check out the new high-performance compact crossover when it arrives in showrooms starting February 2016.

Live photos by Brian Williams.

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