Its aimed to operate silently with all its case fans running with good airflow. What you have done is take out its ability to cool but probably not reduced noise to any decent degree.
Who are you to tell me I couldn't notice a difference in noise?
If I couldn't notice a difference in noise, I would not of removed the 2 200mm and 1 140mm fan.
I havn't taken out the ability to cool my GPU, I know this because there is a huge difference in temperatures if I take out the 200mm fan beneath the GTX 570 as opposed to if it's there. I keep it there.