This 80-Way PCB header is found in many Volkswagen / Audi ECUs from the late 1990s to early 2000s including models such as: Golf, Jetta, Passat, Beetle, A4, A6, etc.
This connector allows for a simple wiring harness to be constructed to adapt an engine management system or piggy-back ECU without permanent damage or modification to the factory harness. Pins can be straightened and directly soldered to.
These ECU headers are not available anywhere else.