You see, the stock fan is set a bit back from the radiator and uses the lower and upper fan shroud very effectively to create a vaccuum to pull air through. I can't say for certain one way or another if putting a stronger fan MUCH closer up (since the electric will need to bolt to the radiator) will still work with a modded fan shroud. It will be so much closer I'm not sure what it will do.
You might just have to try it and find out. This is new terrirory for Zs...well, relatively new since others have tried it in the past.
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