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That's it. I'm doing mine. I'm sure the extra capacity won't be needed unless I'm driving on the track in Arizona during a heat wave.

On the E46, at least the M3, the aux/electric fan is controlled by the DME.

I am seriously tempted to try the non-M fan in my M3.

Well watts in this case is referring to power consumption (electricity), so the mech fan isn't assigned such a value. X3 fan is electric. It looks like it would fit physically, but the connector is...

Newer cars have more powerful fans.

Z4 automatics and Z4Ms have 600W fans. Z4 manuals and E46 non-M manuals have 400W fans. The even newer cars like E90s and E60s have 800W and 1000W fans. Maybe...