Ok so I am gathering pieces for my next project, retro fitting my 2006 e53 with a Bluetooth system. I am the antenna, mic, SES, and the ULF is being ordered. My question is do I need a DSP amp? and what exactly is this??? I dont have navigation... and I dont have the DSP button on my radio player. I understand if I have a 02-06 it is not required... but not having the button makes me question that. Do I need to order one?
thank you