You can hear electric fans over your engine? What exhaust are you running?

The thing I like about electric fans are:
Less parasitic losses (can help up to 10hp, improve fuel economy)
Speed of fan is not dependent on engine speed.
Runs when you need it and not when you don't.... for example, after the engine is shutoff, but not when cruising down the highway.

Of course, all this is only a benefit when you run only the electric fans.