On the mountain roads in rural Oregon, The Fast Lane Car spent some time with BMW’s fastest 5 Series ever built – the M550i xDrive. Back in April, the BMWBLOG team went to Germany to test the very same car and came back impressed.

The BMW M Performance changes over a standard 5 Series are comprehensive and include a 10mm lowered more aggressive stance, unique front and rear clips, wide wheels and M badging. Nearly every aspect of the M550i has been modified by BMW M including the V8 turbo charged motor, transmission, suspension, wheels as well as appearance both inside and outside.

2018 BMW M550i xDrive test drive 28 750x500

The BMW M550i xDrive Sedan is powered by a specially modified M Performance 8-cylinder engine, a first for BMW M Performance. This potent TwinPower Turbo 4.4 liter V8 is able to achieve such a high output by combining turbocharging, direct fuel injection and variable valve timing. The V8 has two twin-scroll turbochargers and helping the engine breathe better is the Valvetronic fully variable valve lift and Double-VANOS variable camshaft timing control. The BMW M550i xDrive develops 456 hp, 480 lb-ft of torque available at an incredibly low 1,800 pm.

0-60 comes in a scant 3.9 seconds.

2018 BMW M550i xDrive test 05 750x499

This M-tuned all-wheel drive system is the secret sauce in the M550i. BMW M cars have gotten so powerful, they have turned to tire-shredding drift kings, meaning they can have hard time putting all that power down. The M550i’s power and torque is sent through an eight-speed automatic Sport Steptronic gearbox to all four wheels, via xDrive.

In short, the TFL review thinks it may be the most under-the-radar speed machine BMW’s put out yet. And those who drive it will know that subdued, luxurious looks can be deceiving.

Let’s have a look

Link for mobile users