A mysterious BMW 3-Series prototype has been caught on camera during tests in Spain

A mysterious BMW 3-Series prototype has been caught on camera during tests in Spain.

The body of the vehicle looks similar to the 335i, but features upgraded brakes with yellow calipers. Currently, no variant of the 3-Series is available with those brakes as standard, which hints this could be a M340i M Performance version of the model.

According to Motor.es, the M340i M Performance will be powered by a new B58B30M0 3.0-liter six-cylinder engine with 365 - 375 HP (268 - 276 kW). It will likely join the 3-Series range in 2015, when the model will be facelifted. The M340i M Performance will compete against the Mercedes-Benz C450 AMG, set to be unveiled during the Detroit Motor Show in January 2015.

There is also a possibility this is the 340i version, rumored to replace the current 335i in 2015.

Hit the source link below for additional spy photos.

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Possible BMW M340i M Performance spied for the first time