I am going to call BS on this, from the wiring diagrams I have looked at there are only very SMALL differences in the systems from the bose in a regular model to a bose in a roadster. I am thinking they are either trying to run the bose speakers off the head unit or have something crossed. Make sure they have something like this in between the head unit and the bose amp if they are in fact using that.
Nissan/Subaru Receiver Wire Harness For select 2007-up Nissan and 2010-up Subaru models at Crutchfield.com