Hello pcfli... thanks for all your help on this thread, very appreciative.  I own two of these beasts, and I love them... I was just wondering if I could put in some fans that were a bit quieter.  I have some 120mm fans that can push 130cfm of air, but I can't find the specs on the fans that are already installed.  I don't want to put a weaker fan in there and overheat the system, and would actually like to improve the cooling because they run around 55-60c right now.  Do you know the specs of the installed fans and can they be upgraded?