Swiss tuning firm FAB Design has just pulled back the sheets on its powered-up Mercedes-Benz SLS AMG proposal. Though the company has yet to publish all the details, we do know that the tuner found a way to extract 40 more ponies from 'Gullwing' door supercar's V8 engine pushing total output to 611-horsepower. The extra oomph allows the SLS AMG to do the 0-to-100km/h (62mph) sprint in 3.7 seconds instead of the stock model's time of 3.8 seconds.
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