Buick Grand National and especially the GNX, but there was little-known Regal-based turbo-six coupe that preceded them.
From the March 1999 issue of GM High-Tech Performance: The 1986 and 1987 Buick Regal Grand National set the performance bar high in the 1980s, not with a V-8 but with a turbocharged intercooled V-6.
Early twin-turbo V6 tech delivered 300 hp with smooth power, strong tuning headroom, and iconic reliability lessons that ...