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The 2018 Mercedes-AMG GT C Roadster is hunting for Porsche 911 Cabriolets

With the arrival the new convertibles and GT C trim level into the Mercedes-AMG GT sports car family, Porsche's 911 should be a little worried.

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Jon Wong

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Mercedes-AMG will be adding two convertibles to the GT sports car lineup this fall.

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Standard GT Roadster models will have a 469-horsepower twin-turbocharged V8 engine.

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The GT C Roadster features a 4.0-liter twin-turbo V8 that gets different pistons, fuel pump and turbos to push out 550 horsepower and 502 pound-feet of torque.

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Mercedes-AMG says the GT C Roadster will hit 60 mph in 3.7 seconds and reach a top speed of 196 mph.

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Like the coupe, the roadster models will feature a seven-speed dual-clutch transmission.

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To improve stopping grunt, carbon ceramic brakes are available as an option.

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Other upgrades to the GT C Roadster compared to the regular GT Roadster include wider rear body work, an electronic limited-slip differential, rear-wheel steering and wider rear tires.

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To make up for the missing fixed roof, the roadster's chassis is upgraded with thicker side skirt walls, additional dashboard and windshield frame reinforcements and a rear strut tower brace.

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Both the Mercedes-AMG GT Roadster and GT C Roadster will go on sale this fall.

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Pricing isn't available yet, but expect the GT Roadster to be a bit more expensive than the $111,000 AMG GT, and the GT C to carry a price tag above the $131,200 GT S.

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