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Cadillac Introduces First-Ever Twin-Turbo V-8 Engine Sophisticated, all-new 4.2L Twin Turbo V-8 is at the heart of new CT6 V-Sport’s exemplary performance Cadillac begins a new chapter in its high-performance legacy with today’s introduction of the brand’s first-ever twin-turbo V-8 engine. It is the centerpiece of the new CT6 V-Sport, an engaging sports sedan infused with DNA of Cadillac’s world-renowned motorsports program. Developed as a small-displacement V-8 in the classic vein and offering exceptional power density of 131 hp (98 kW) per liter, this new Cadillac-exclusive 4.2L Twin Turbo V-8 — GM estimated at 550 horsepower (410 kW) and 627 lb-ft of torque (850 Nm) — elevates the CT6’s performance to a new plateau and offers drivers an unparalleled experience behind the wheel.  An optional 500-horsepower version will also be available. “Cadillac’s performance technology reaches new heights with the new and exclusive 4.2L Twin Turbo V-8,” said Cadillac Presid