The future of the Cadillac CT6-V is still up in the air. The CT6 won't be produced by General Motors once the Detroit-Hamtramck assembly factory ceases operations in January 2020. As a result, we may informally say that this 550-hp sports car is a dead man running.

The only flagship sedan that can turn a curve with any degree of sharpness is Cadillac's $92,790 CT6-V, and its twin-turbo V-8 is the closest the company has gotten to giving this chassis the engine it deserves.

The Blackwing's elegant high-end refinement takes the place of the small-lopey block's idle and rock-star cry. The 4.2-liter V-8 engine in the Caddy makes smooth, deep, yet restrained revs. (In the CT6 Platinum, a milder Blackwing generates 500 horsepower and 574 pound-feet of torque.)