Have been considering this radio for my ride even before I got the car.

Looks a little like a classic Becker. Not as fussy as the stock unit. And a USB stick slot up front.

Some of the Blaupunkt units also have this feature. Their Memphis MP66 is particularly popular with board members and is easily installed, even by Luddites

Now the hard technical stuff

The head unit in our cars is just a tuner. The amp is under the floorboards on the passenger side. Basically you're plugging into the antenna and a harness to the stereo IIRC.