swathdiver
Full Access Member
Check out ADC mobile... talk to Walt... he is a vendor/member on here and an all around good guy that has a ton of knowledge from many years in the audio/video business. He can hook you up with the Rosen GM1210. It is plug & play with no additional adaptors required and will only run you about $6-$700 and the sound quality is ALOT better than the stock Navi HU.
I didn't know that guy was on here, let's tag him.