A widebody next-gen SL prototype has been spotted cruising the streets around the Nürburgring and is tipped to be a new AMG Black Series version of the facelifted SL. Huge fender flares, a rear diffuser with quad exhaust pipes and a fixed roof will differentiate the new Black Series SL from the regular AMG arsenal and expect to see plenty of carbon-fiber pieces littering the car including its new roof. The vents in the camo covering the hood also suggests there'll be a new vented bonnet under there.

Previous reports claimed Mercedes was developing a new lightened performance version of the SL, which would weigh up to 100kg less than the current model and output around the 700hp mark. Mercedes is also working on a new sports car with its racing partner HWA but this is said to be based on the next-gen SL platform.

Head over to World Car Fans to see the shots in full or click here to see more spy shots of the facelifted SL testing at the ‘ring.