[Bottom Board swap]

Does this mean a WRXLink 5-6 pre V1.4 can be upgraded for the E-throttle expansion connector?

[converting wasted spark to squential spark]

Yeah ok, spew.

Just out of curiosity, which outputs are Ign 5/6? The pinout doesn't say, just 7/8 in the expansion loom.

[converting wasted spark to squential spark]

I'm about to undertake this also. PNP V5/6.

Do I have to mess around swapping the factory wiring, or can I just get the ECU to fire 1,2,7,8? (7/8 being the expansion loom).

Ign 3 is currently a factory thermo output and Ign 4 was a second fan, but been changed to a second, staged, fuel pump.