On the other hand the primary and secondary on the turbo (with the same timing)  would have air flow (as well as DIE pulses) all on the same timing and airflow cycle.  So I can't see why it wouldn't work to combine them. 

 

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.

Ed;

I would think that unless you were very careful a “Y” would have significant effect because you have a sudden change in the cross-sectional area which would dissipate the pulse energy and/or cause a reflected pulse.  No?

Al