We still haven't found a cheaper place to source this beast from? I've got to put my parts order in next week for my auto 330i and I might stick with a 390w fan.
Our temperatures get up to 100 farenheit but don't go below 50 or so here in Brisbane. I haven't found anyone who can tell me for sure whether the 390W fan is strong enough for an autoboxed car in a high temp environment or not, but I guess It's about my turn to be a Guinea Pig.
But still... If anyone can get a Z4M fan for less than $400 I'll be sold on it.