The first popular aftermarket car made by Yenko came in 1965, in the form of a modified version of the Chevrolet Corvair.
The 1970s saw the decline in muscle cars due to higher insurance premiums and tighter emission rules.
Additionally, the new "Yenko Deuce", as it was known, had extensive suspension, transmission, and rear axle upgrades along with some very lively stripes, badges, and interior decals.
Due to difficulties with United States Environmental Protection Agency certification, he only sold the modified Vega without a turbocharger.
In addition to Chevrolet, Yenko dealerships included Porsche, Audi, Fiat, Honda, Subaru and Saab.
Yenko, along with his three passengers, died on March 5, 1987 while bringing his Cessna 210 in for a landing near Charleston, West Virginia.