I feel like i just created more questions.So each injector driver is capable of firing 6 high impedance injectors at one time. So each pair of complimentary cylinders are wired together on each bank.
Ie.... just like wasted spark but with 2 drivers instead of 4.
So in standard trim the ms3 can fire 6 injectors per bank or 12 injectors with 2 drivers.
Now when you add the ms3x card to the ms3 it gives you 8 injector drivers, so each injector will have it's own output driver.