Mercedes-Benz and its in-house tuner AMG recently revealed its updated SL fleet but one car, the pinnacle of the SL range, remains unseen.
The new model is the upcoming SL Black Series from AMG, a super-sports version of the SL that could potentially upset the SLR supercar in the performance stakes.
Heavily camouflaged prototypes have been spotted testing in Germany, and these latest spy images of the test-mules are the most revealing yet.
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