first of all hello and thank u for allowing me to be part of this forum.

Ok here is my question. I have recenlty purchased a D3 and i want to install it in my 2005 gmc sierra. The questions i have are what harnesses am i going to need in order to keep my BOSE/onstar (not subcribed) working as well as my steering wheel controls and I want my XM radio to work, i dont really want the XM traffic just the radio. And the next question is how much am i looking to spend on all these additions to the D3. I thank you all who take the time in reading this and responding to me. All your advice and help is welcomed.

thank u

The XM radio that is currently in your car will not work with the D3. You have to get the Pioneer XM tuner. But when it's all installed and working, you can call and transfer your current account/service over to the new tuner.