I have an 05 touring model. It came with a BOSE system. Having heard other BOSE systems, I am a bit disappointed in sound quality of this system in the car. Does anyone know if they are using the low end models of BOSE in the 350Zs? Does BOSE even have a low end model?

I was recently told that if I replace the HU, I would likely get better sound quality from the factory installed speakers. Can anyone confirm this?

Also, if replacing the HU will improve sound quality, what HU models are recommended? Ideally, I would like to install something with bluetooth capabilities so I can make calls from my car rather than using an ear piece.

Thanks!