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Like the ATS, Buick's GN will offer the choice of a turbocharged 2.0-liter four (currently rated at 272 horsepower) or a 3.6-liter V-6 that makes 321 horses in the ATS. The wicked GNX, available only in the official shade of evil (black), will be powered by a twin-turbo *3.6-liter V-6 that should be good for 400 horsepower. The transmission roster will include manuals for the turbo engines and automatics across the board. The eight-speed Hydra-Matic due in 2014 should serve nicely here.