C197 coupé, deliveries from June 2013 and sold as a 2014 model year in the US — the final SLS and the only gullwing Black Series: the M159 6,208 cc naturally aspirated V8 uprated to 464 kW / 631 PS / 622 hp at 7,400 rpm with an 8,000 rpm redline (revised valvetrain, camshafts and intake; lightened crank assembly), 635 Nm / 468 lb-ft; AMG SPEEDSHIFT DCT 7-speed transaxle mounted 10 mm lower with a carbon-fibre driveshaft.
SLS AMG GT3-inspired aero with carbon panels, a lithium-ion battery (−8 kg) and a titanium exhaust; 1,550 kg / 3,417 lb US kerb; 0–60 mph 3.5 s; 196 mph. US MSRP $299,550. The most powerful naturally aspirated production V8 of its time.
The final SLS, the only gullwing Black Series and the most powerful naturally aspirated production V8 of its time. Delivery-mileage originality, M159 valvetrain service and documentation of US vs ROW delivery are the defining factors.