Leave the mechanical fan and forget the electric... for some ungodly reason it seems no one ever manages to install them properly and I'm sick of all the "my fans caught fire and my wire harness is f@#%ed" sob stories... besides, there are virtually no gains to be had from it. The more electrical drain you put on the alternator the harder the alternator become to move... you lose what you gain.
If you feel you need something which imposes less resistance the best solution is a flexible fan... they're lightweight and they flatten out the faster they move causing a drastic decrease in resistance while maintaining a *reliable* source of airflow.
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