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  Spy cameras got up close and personal with the barely-disguised M5 as it was being re-filled. Pics: Carparazzi. Photo Gallery

BMW?s forthcoming F10 generation M5 has been setting off Geiger counters around the Nurburgring.

While BMW’s forthcoming F10 generation M5 has been setting off Geiger counters around the Nurburgring with its thunderous torque, it’s also been burning out spy cameras.

And one got unprecedently up close and personal with the Bavarian’s barmiest bahn-stormer to date, swooping as the barely-disguised M5 was being re-filled.

Clearly visible in these close ups shots are the front bumper and the air intake to feed the bi-turbos – this being the first ever blown M5.

More revealing are the interior grabs, showing the new-style dashboard, new steering wheel, steering wheel shift paddles, dedicated sports seats and gear selector with "M" sign.

Lingering disappointment that BMW has dispensed with the previous cars V10 should be short-lived. The F10 M5 runs a 4.4 bi-turbo V8 good for 558kW and a mountain-levelling 800Nm.

With an anticipated 0-100km/h sprint time of less than four seconds, it will be not only the fastest four door BMW to date, but aiming the title of the world’s fastest sedan.