The Gulfstream 400 was introduced In 2002, as part of Gulfstream’s product line transformation. Technically speaking, the G400 is a G IV SP. The G400 comes with such a high level of standard cabin and avionics features, the only options are a head-up display, security system, and a local area network (LAN) for the cabin.
The G400 production was initiated just after the 500th G IV model was produced and ceased in 2004, when it was succeeded by the G450.