General Motors is trying something different with the upcoming Cadillac CT6. It makes liberal use of aluminum to keep weight down and boost fuel economy, and it will spearhead a new generation of V6 engines for Cadillac.

GM announced today that the CT6, set to debut a few weeks from now at the New York Auto Show, will have a 3.0-liter twin-turbo V6 putting out 400 horsepower and 400 pound-feet of torque. With 133 horsepower per liter, they’re calling it “one of the most power-dense V-6 DOHC engines in the world.”

It sounds like a really high-tech motor. In addition to the turbos, the new V6 will pack cylinder deactivation and a stop-start system to save fuel. They promise a broad torque curve and more power and torque while being quieter than its German and Japanese competitors. Cadillac also says the motor will employ a manifold-integrated water-to-air charge cooling system like the new ATS-V to keep it cool despite all that turbo heat.

In addition to the turbo engine, the CT6 also gets a new version of the 3.6-liter naturally aspirated V6 seen in a lot of GM products. There it’s been improved to boast 335 horsepower and 284 pound-feet of torque. That engine will also see duty in the ATS and CTS later this year. It’s the middle engine on the CT6 range — the base motor is the 2.0-liter turbo four.

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Then there’s that twin-turbo V8 they’re also working on for the CT6, the one CEO Johan de Nysschen told us about in his Jalopnik Q&A. That one sounds fun, too. We’ll see more from the CT6 in New York soon.