system
A chat on subreddit /r/pcmasterrace
human
These tiny fans have a CFM of just 5. They won't help too much... 

5 CFM is what your intake fans would do if you simply just removed the PCI-E brackets and made a larger opening for air to exhaust easier. Air moves in paths of less resistance. So you would more than likely get the same effect if you just remove the pci-e brackets by themselves.

Typical 120mm fans move about 35-50 CFMs for example.

I don't think this mod is worth the effort.
gpt
You gotta admit those 40mm's are darn cute though!