You may get some disturbance of the airflow, but the "Y" won't have much effect on the DIE pulse as it has no problem splitting and turning corners since the pulse is really not flowing air, but an pulse of energy translating across the distance by bumping one air molecule into the next.

Hm... I still don't see the difference from flowing water that mysteriously won't split evenly at the Y.

Well, one big difference is that water is incompressible whereas air is not.  I am not a fluid dynamic expert, but I believe that accounts in part for the sensitity of water flow to a "Y" but which appears to affect airflow somewhat less.

 

But, who knows - just guessing in the dark

 

Ed Anderson