Gulfstream is staying with Honeywell avionics for its G300 and G500 business jets, descoped versions of the GIV-SP (now G400) and GV-SP (now G550). The G300 will use the G400's SPZ-8400 avionics suite and the G500 will feature the G550's PlaneView cockpit, based on Honeywell's Primus integrated avionics.

Source: Flight International