The BMW M4 Convertible has been spied possibly one last time ahead of a rumored official debut in late June at the Goodwood Festival of Speed.

The lightly camouflaged M4 Convertible was undergoing last-minute testing near the Nürburgring circuit in Germany. This is one of the very few times we have the opportunity of seeing the car with the metal top down looking quite menacing with its matte black paint, wide body and a quad exhaust arrangement borrowed from its fixed roof cousins, the M3 Sedan and M4 Coupe.

These latest M members are equipped with a 3.0-liter 6-cylinder TwinPower Turbo delivering 431 HP (317 kW) and a maximum torque of 550 Nm (406 lb-ft). The high-performance convertible will also borrow the standard 6-speed manual transmission and optional 7-speed DCT while in terms of performance it will be a bit slower than the other two because of a minor weight penalty.

The 2014 BMW M4 Convertible will likely be introduced towards the end of June together with a 30th anniversary M5 special edition at the Goodwood Festival of Speed before going on sale in the second half of the year.

Gallery: Lightly camouflaged BMW M4 Convertible spied with the top down

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