Not only did these two changes improve airflow at that mount, but they allowed us to start building a case that would allow a lot of airflow throughout the whole case:  We put a TT-900 in that Upper Back 5.25 HD mount--the Just Cooler / TT-900  'dual exhaust box'.  Those fans, venting out the back, allows the use of more and/or higher-speed intake fans .  We call these versions the HOTRODS.

While coolcases concentrates on developing and building extreme cases that utilitize low- noise fans, we know that many of you already have your own fans and PS--so we're providing a barebones chassis for you.  All modifications are completed and a TT-900 is installed--all you have to do is install your own fans and PS.  Or, go to the storefront and select the fans you want to install, finish the order, and tell us to set up the case--we'll do the installation for you, as well as give you a package discount.  

FYI, the 'recommended' version shown further down has a raw flows of about 485 cfm--and we use only Panaflo Low- and Medium Speed Fans to obtain that.