I am wondering if the radio itself(not the face plate) is the same in the seadns as in the coupes. I am having issues with my Bose unit in my coupe and found a good deal on one from a sedan. Second question... are all of the 6-disc units Bose? It says on the sticker that its made by clarion but it does not have any Bose markings on it. Thanks for any input!

 

Sedan and coupe headunits are interchangeable same year for same year from 2004 - 2006. Some early 2003s used a different unit that is only compatible with another one like it, and in 2007, sedans changed completely.

Bose or not, they're 6-disc changers. The only major difference is the presence of the internal amp in the non-bose units. All the headunits are made by clarion.

Not knowing the part #'s, the easiest way to tell is by the heatsink present in the non-bose units:

 

Thanks man, helped out a ton.