Why do you think so? Is it the noise? You could keep the original fans and fit a fan controler and adjust the speed (and thus noise) to suit.

Get yourself some Delta fans if you're not bothered about the (very loud) noise.
3x190 CFM Fans should keep you pretty chilly!
Get yourself some Delta fans if you're not bothered about the (very loud) noise.
3x190 CFM Fans should keep you pretty chilly!
and cause you to lose your hearing in about 2 days.

