Ithink it's n early superchip with the connector pin coming from the MAP sensor snapped on the back of the yellow connector and wired through the black box with the yellow and green wires.
Black and Red providing power.
Diggin through my archives, here's one I ripped out of a supposed standard ECU a few years back :
OE/STi Style Chip upgrade (one of my old Polar Performance productions)
ESL Version 1
ESL Version 2
where they fit....
