With the shroud in place the stock fan is excellent at it's job.
Too many novices have tried converting without really knowing what they were doing leaving themselves with burned up wiring, fried batteries and engine bay fires. No way I'm going to recommend you try.
Besides, the losses caused by the stock fan can be thoroughly reduced by ensuring that your fan clutch is working and the oil in it is fresh and swapping the fan itself for a flexible aluminum fan.
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