I might add that according to Realoem.com, all the Z4's had 490W fans and the "hot-climate" versions (hopefully the Australian cars!) had 600W fans like the Z4M.
Basically, the 600W fan wasn't just on the Z4M and a plain E85 fan is still an upgrade on an E46 fan.
EDIT: I just paid $7.50 for a 600W Z4 fan off ebay. *WIN*
Last edited by trive2; 03-18-2012 at 08:29 PM.