Is there a way to add another sync data plug? I bought a wireless dongle so my phone connects wirelessly to carplay, but the dongle has to be connected two one of my two ports at the lower part of the dash (i have the jump seat), meaning i cant charge two phones anymore. I'd like to add another port, maybe hidden in the glove box, for the dongle.

 

Have you considered just adding an extra charging port in your dash? Something like these? It's pretty easy to install and just tap power for it off your existing 12v plug in the dash.

 

Agreed. Simple enough to add additional charging ports.
I found a small enough 12v dual USB outlet that plugs into the cigarette lighter in the dash and it's small enough the little door closes right over it when not in use.

 

You may be able to tap into the back of it but I haven't done it myself.

 

You guys are way overthinking this. Lots of good valid alternative solutions. But the core answer is no. You cannot add a second data port to simultaneously connect two phones to Sync.