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A mysterious BMW prototype has been spied undergoing testing in Germany.

While our spies are normally pretty good at knowing what they see, they're a little stumped by this particular prototype. All outward appearances suggest the car is simply a 2-Series Coupe but a closer inspection reveals the model has a shortened wheelbase, a lowered roof and a smaller windscreen. We can also see a carbon fiber roof, hood and rear spoiler.

These modifications suggest the prototype is a mule for a high-performance model with a short wheelbase. Nothing is official but the natural candidate is the highly-anticipated Z5 which will be jointly developed with Toyota.

Regardless of what it is, the test driver was pretty peeved to be caught on camera.

Gallery: Mysterious BMW spied, is it a mule for the Z5?

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