The noise is caused by Air, plain and simple. You need to eliminate the excess air and to do that you need a gurgle buster or durso. To use either of these you need an Overflow. Adding a T like Newguy said I don't think will work as it will just suck the air from your 3" opening. A gurgle buster is essentially the same as a durso, just you don't need as much space in the overflow. You 'might' be able to friction fit a pvc pipe with holes drilled in it, inside your 3" pipe and slide it up and down until your flowrates mesh. It's risky as the top of the gurgle buster pipe would probably be above your tank maximum level. In the event of something like a snail getting sucked in, your tank will overflow as there is no chance of a syphon being created with the rising water level.
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