installing after market radio, which interface do i need?

[pwrhse2k]

The gmos-04 interface is a piece of crap! Lots of speaker pop and alternator whine. I have the Kenwood 7100 Nav and will be pulling the gmos-04 interface and bose system out and wiring up aftermarket components. I'm yanking the onstar and don't give a hoot about the door chimes. I want to hear good quality sound coming from the speakers and you definitely don't get that with the interface installed. TRUST ME!