The fourth generation of the Lotus Esprit is known by its project code 'X180,' as it was never given an official series designation. The X180 Esprit cars were fitted with a range of inline four engines, offered in both naturally aspirated and turbocharged forms. The most notable X180 variant is the Esprit S, a stripped down, turbocharged car. The X180 Esprit was in production until 1993 and was replaced by the Lotus Esprit Series 4.