Cadillac is adding a big dose of performance to luxury.  The company has announced the CT6 V-Sport.  It’s the first time they’ve added V-Performance to the top-of-range sedan.  The performance comes from the all-new 4.2L Twin Turbo V-8… that pumps out 550 horsepower and 627 lb-ft of torque.  As we’ve seen with other car makers, Cadillac has mounted the turbochargers at the top of the engine in the valley between the heads in an effort to eliminate turbo lag.  The new engine works with a 10-speed automatic transmission.