The modifications begin with the 4.4 litre turbocharged V8 engine. A retune means power is up from the regular 552 bhp (412 kW / 560 PS) to 591 bhp (441 kW / 600 PS), while peak torque rises by 20 Nm (15 lb/ft) to 700 Nm (516 lb/ft).
Performance isn't dramatically improved compared to the regular M6 models, though. For example, a Competition Package-equipped M6 Gran Coupé can complete the benchmark 0-62 mph (100 km/h) sprint in 3.9 seconds instead of the usual 4.2 seconds.
What's more, top speed remains electronically-limited to 155 mph (250 km/h) unless the optional M Driver's Package is specified too. Doing so lifts that figure to a much stronger 189 mph (305 km/h).
Complementing the extra output are some chassis tweaks. As well as a firmer suspension set-up, the steering is more direct and the rear active differential has been altered to deliver better traction.
Finishing touches are provided by a set of two-tone 20” alloy wheels and some black chrome exhaust tailpipes.
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