In 1992, the Gen 4 car arrived at the sport when steel bodies became primarily custom made instead of using stock pieces, and wind tunnels became a staple as teams worked to gain aerodynamics.
The bumpers, nose and tail composed of molded fiberglass based on production counterparts. Generation 4 cars feature highly modified bodies with teams to spending hours in the wind tunnel to gain aerodynamics. The generation has been described as the generation that removed all "stock" aspects from stock car racing and as aerodynamically sensitive as a Le Mans Prototype.
The Generation 4 car was the NASCAR vehicle generation used from 1992 to 2007 full-time in the NASCAR Cup Series, in the Busch/Nationwide Series until 2010, and in the ARCA Racing Series until 2017. Rusty Wallace's 1994 Ford Thunderbird at Michigan International Speedway
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