[240 2NR]

The stock fan is actually engaged/disengaged with a clutch. Its a clutch fan (similar idea though to how a viscous sytem might work). The benefit of electric fans is they generally don't need to be on. Once you're rolling along the incoming air is more than sufficient to cool the radiator. However it is only once you stop that the fans *may* be needed. The trade off made with a clutch fan is they are almost always on at low speed (if the coolant is getting hot or not), even in winter. This can suck off some noticable power since it's driven directly off the engine and contributes to parasitic losses. Going to electric fans (installed properly and of nearly equal air flow) should provide no difference (or at least no negative) difference in cooling capabilities. If your system is showing signs of weakness, your best bet would be replacing the coolant mixture or upgrading the radiator.