The Pontiac Fiero was a mid-engine sports car built by the GM Pontiac division in the mid 1980s. It was unique in its time and renowned for the innovative use of a structural space frame and composite plastic and fiberglass body panels.
When the Enterprise crew went back in time to return humpback whales to the 23rd century a Fiero was seen in traffic as the crew crossed the street, around the time that Captain Kirk was nearly run down by a car. Another Fiero was seen on the street near the plastics factory where Scotty introduced transparent aluminum to the 20th century. (Star Trek IV: The Voyage Home)