I am pretty happy with my flex a lite dual 12 inch setup. Seems to do well at idle compared to a mechanical fan. Have not overheated my 505 yet, although it is not an A/C car and I am too wimpy to drive it on really hot days any more.
I do like mechanical fans for towing, though. That was one of the selling points for me on getting a gas HD truck (6.0 vortec) instead of a half ton. When the engine is pulling hard, a mechanical fan can pull a crazy amount of air.
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