Cadillac has announced details of a new Twin-Turbo V-6 engine and eight-speed transmission, firsts for the brand and signature features of the all-new 2014 Cadillac CTS midsize luxury sedan debuting next week at the New York Auto Show.

Cadillac claims the Twin-Turbo V-6 is the most power dense six-cylinder engine in the midsize luxury segment; it’s a 3.6L with 118 horsepower per litre (88 kW/litre) and comes with an eight-speed automatic that Cadillac says enhances fuel economy and acceleration over a six-speed automatic.

“The new Cadillac Twin-Turbo brings a new dimension of technologically advanced performance to the all-new 2014 Cadillac CTS sedan,” said David Leone, executive chief engineer. “Delivering power and sophistication, it marks another large step forward in the product-driven expansion of Cadillac.”

Rated at an SAE-certified 420 horsepower (313 kW) and 430 lb.-ft. of torque (583 Nm), it is the most powerful V-6 ever from General Motors. Cadillac says it also has 15% greater power density than BMW 535i’s turbocharged 3.0L six, which is rated at 300 horsepower (223 kW), for a ratio of 100 horsepower per litre (74 kW/litre).