I have the stock bluetooth unit in my 2011. I use it not only for cell phone communication, but also for interaction with my iPhone's "intelligent assistant" (Siri) and I rarely have any kind of issue with clarity of communication.
If I were having such trouble, the first thing I'd do would be to pull all the stuff out of the hatch floor and line it and the outside of the wheel wells with some 1/2 inch foam.
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