Coils are OE Volvo from an S80 T6. They have built-in power stages and are suspected to be internally identical to the Bosch Motorsport Single Fire PT coils, data-sheet here:

Currently running:

Coil pin-out:

Pin Designation
1 Trigger
2 Not Used
3 Ground
4 +12v

The coils have built in BIP373 drivers and pull up to +5v to fire. VEMS is configured as 2+6 with logic level outputs going to the coils. 'Invert driver output' is set to 'Disable'.

Connectors/pigtails sourced directly from Volvo: