unique and rare, you try to see these two old cars. DuPont Model G Speedster. In 1923 the Model C was introduced. It was powered by six-cylinder Continental engine. This model was soon replaced by the Model D powered by a six-cylinder Wisconsin engine. In 1927 the Model E was introduced. It was experimentation with supercharging the engine and did not meet with the desired results. The following year the Model F was introduced