Z31) US Sales: 17,652 units 1992 Driver's airbag made standard Dashboard and door complementary material changed from fabric to suede Separate mirror heater switch eliminated (combined with rear defroster switch) Power adjustable driver's seat standard on T-top models Mirror heaters made standard, and are activated with front windshield defrost button US Sales: 6,708 units 1993 Turbo oil line insulation changed Convertible option added Brake caliper material changed from aluminum to iron New style fuel injectors for the non-turbo, (except convertible) Upgraded Bose stereo made standard Air injection valve (AIV) system eliminated Non-turbo model, (except convertible), ECUs changed from 8-bit to 16-bit by Japan Electronic Control System Co. US Sales: 11,599 units 1994 Rear spoiler design changed to a taller, pedestal-type Seat belts redesigned; attachment points moved from door mounts to pillar mounts Super HICAS system changed from hydraulic to electrical actuation (previously power steering actuated) New style fuel injectors for the convertible Passenger's side airbag introduced and made standard Keyless entry added Titanium keys discontinued in November 1994 'Reset' button removed from clock Off-white 'Pearl' color is dropped. Future 'Pearls' are more of a semi-metallic white US Sales: 5,320 units 1995 New style fuel injectors for the twin-turbo (Less prone to failure from modern ethanol blended gasoline) Front fascia became body colored instead of gray strip Twin-turbo model ECUs changed from 8-bit to 16-bit (in late-1994 model year) Special 25th Anniversary gold paint available Version S trim level made available (Japan only) 16" BBS mesh wheels made available as an option (Japan only) US Sales: 3,135 units 1996 Variable cam timing (NVTC) dropped due to emission regulations OBD II electronics introduced Driver's seat back rest no longer included adjustable side bolsters Sales: 2929 units - the last 300 of which are the "Commemorative Edition" MY1997-1998 (Japan only) Twin-turbo front fascia adopted by all models, presumably to lower production costs Lift-style window switches Version R trim level made available T-top option dropped from 2+0 models Automatic transmission option dropped from 2+0 models MY1999-2000 (Japan only) Convertible chassis dropped Revised manual transmission using stronger synchronizers to combat a common "soft-synchro" problem that had become apparent on earlier Z32s. Instrument cluster with white dials New front fascia Xenon HID headlights New taillights (featuring clear turn signal lenses, chrome housings and black pinstriping) New taillight centre panel ("300ZX" lettering in red instead of silver) New rear spoiler (standard on TT models, option for NA