As great farewells go, the Cadillac CT5-V Blackwing is right up there: a love letter from General Motors engineers to both the Chevrolet small-block V8 and the super-saloon format.
Both are on borrowed time as Cadillac embarks on its journey to become an all-electric brand, beginning with the weird-looking Lyriq crossover next year and continuing, we're willing to wager, with a long line of luxurious high-riding SUVs.
That might explain why absolutely nothing has been left on the table with the latest CT5-V Blackwing.
A natural rival to the BMW M5 CS, the CT5-V Blackwing gets GM's LT4 Gen 5 supercharged 6.2-litre V8 engine that was last used in the C7-generation Chevrolet Corvette Z06.
It already employed lightweight titanium valves, forged connecting rods and pistons, plus a large 1.7-litre Eaton TVS supercharger, but further work has been done to improve the cold air intake and exhaust to liberate 668bhp and 659 lb ft of torque – a healthy improvement on both the 'Vette Z06 and Chevrolet Camaro ZL1 (plus 18bhp and 9lb ft).
Those figures also utterly humiliate the M5 CS, not for power (626bhp) but for torque (553 lb ft) – although the four-wheel-drive German annihilates its American rival off the line with its 0-62mph time of 3.0sec (versus 3.6sec to 60mph).