I need some help deciding on an aftermarket head unit. I'm looking for something with flat and accurate frequency response. I also want to know if I need some sort of kit to install the aftermarket stereo (since those bose stock stereo is so huge) Sorry I am kind of a noob to car audio, but I don't want to ruin the OEM look too much.
Edit: Is the bose stereo a "double DIN" head unit? Is that the kind I should be looking for?

 

https://my350z.com/forum/audio-and-video-52/