So you do want to change to vnt shadowmaker?? that'll be a bit of work but it'll be possible if you changed the ecu [some here theorized in the past that it could be done without changing it,,,
]
now, v6 and turbo only make me think about something,,,
I guess that using the ecu signal to operate 2 N75's at once must not be that difficult as long as you can provide the valves a decent voltage/current to operate [maybe using a relay],,, then you would need to re-design the vacuum circuit but I guess that can be done too [maybe you can place a T joint where the N75 connects and then connect two of em,,,]
to this point you put say a vnt17 every 3 cylinders,,,
am I talking BS here or you do reckon it can be done?