The Regal Grand National, a boxy black coupe that still sported Buick portholes emitting the superheated air from a 3.8-liter turbocharged V6, had little to say to its brethren like the Buick ...

As such, if real, this Cadillac CT4-V Blackwing-derived two-door Buick Regal Grand National would feature 472 hp and 445 lb-ft (603 Nm) of torque, a six-speed Tremec manual transmission or a ten ...

Arriving in 1987, the GNX took the Buick Regal—which was already offered in go-fast Grand National form—and turned up the ...