Gulfstream Aerospace G1159C IV
An example of this type was bought early nineties and is used for fast VIP transport. This aircraft was bought on the second hand market and completely overhauled. During the operational use a number of problems occured, so a few years ago the electrical wiring was completely replaced.
This particular Gulfstream IV proved to have been used by Gulfstream for testing purposes and its cabling was modified.