The Nissan 180SX was produced as a sister model to the Nissan Silvia from the model year 1989 through 1998. The 180SX differed from the S13 Silvia in that it featured pop-up headlights and a liftgate with different body work at the rear of the vehicle. The name 180SX was originally in reference to the 1.8 liter displacement CA18DET engine used in the chassis. In 1991, however, the engine was upgraded to a 2.0 liter model, offered in two forms: the turbocharged SR20DET variant and the naturally aspirated SR20DE engine, which was introduced in 1996. Although the new engine was of larger displacement, the 180SX nomenclature remained.