Actually the relationship is not that obtuse. The Olds Jetfire, Corvair Monza and SAAB Turbos were the first and only affordable turbocharged cars in the United States. SAAB pretty much singlehandedly made turbocharging a household concept. BMW had a 1974/5 2002 Turbo and Porsche had the 930 Turbo but, well that was $26K in 1976, ahem. The SAAB was about $11K in 1978.
Related: Heavy Chevy.