You won't notice a difference in the normal radio signal, because it is your normal radio signal. But you will not get the CD/MP3/IPOD (digital) quality out of a FM modulator. You will get FM quality out of anything you connect to it. It will work, but it is no different than the old tape in the tape deck auxiliary. I don't mean to knock on you. You put together a great write up with good pics and a clean install...Im just sayin it's a digital world now.