The first generation of the Mazda Miata, internally known as the NA, was inspired by classic roadsters such as the MGB, the Fiat 124 Spider, and the Lotus Elan. Indeed, Mazda engineers disassembled an Elan while designing the original Miata. The NA was introduced powered by a 1.6-liter twincam four producing 116hp. From 1994 onwards, displacement was increased to 1.8-liter in its inline four, now producing 128hp. Visually, the earlier versions, known as the NA6, are scarcely distinguishable from the later NA8 save minor badge differences - the Miata script to the right of the rear license plate is painted red on the NA8, black on the NA6. The NA8 is fitted with airbags for both the driver and passenger, compared to just the driver in the NA6. Apart from a Base Model with a number of trim levels, notable variants include the 1991 Special Edition, the 1992 Black Miata, the 1993 Limited Edition, and the 1994 to 1997 M-Edition Miata's. In Japan, it was sold as the Eunos Roadster.  The NA generation of Miata's was succeeded by the MX-5 Miata NB for model year 1999.