Electric fan?
 

At this point an electric fan is about the only engine mod I haven't done.
Is it worth much power?
Are they as effeceint as the stock fan?

Re: Electric fan?
 

It depends on the fan design and size as to whether it's as efficient as the stock fan belt driven fan. The only power you'll gain from going to an electric is freeing up the power loss due to parasitic drag. i.e. it takes a small amount of your engine's power to turn the accessories, including the fan.