The next-generation BMW X4 M has been spied again, though this time the vehicle was spotted on the streets of Germany rather than in the US.

Compared to the prototype we saw in August, not a lot has changed. However, there are different alloy wheels - albeit mismatched - that differ from the vehicle spied in the States a couple of months ago.

Key features that hint at the full-fat M version of the new-generation SUV coupe include the aggressive front fascia with large air intakes, chunky side skirts and rear bumper area, along with the large quad-tip exhaust pipes on the rump. Another distinguishing element are the massive cross-drilled brake discs behind the large rims - the latter likely around 21-inches in diameter.

Under the heavy camouflage the X4 M looks to have lowered suspension, rear spoilers, and a powerful turbocharged engine.

The motor in question is believed to be a new 'S58' 3.0-litre twin-turbo straight six, with a projected power output of around 335kW - which is up 18kW over the current 'S55' unit used in the M3 and M4.

Both the X4 M and its closely-related X3 M are believed to share this new engine, which should see the Bavarian SUV pair challenge the bi-turbo V8-powered Mercedes-AMG GLC63 S twins in the performance stakes.

It's unknown when we'll see the production version of the X4 M, let alone the standard version, officially revealed. However, we did bring you images of an undisguised X4 at the end of August, so if you want a clearer look at the new car's design, click here.

Stay tuned to CarAdvice for more updates over the coming months, and click the photos tab for more images of the BMW X4 M.