Hey all i know there are lots of posts about this but a lot of information in to many locations and im looking to get a few answers on my specific questions. I know that you hook this motorola item up to your existing onstar module which is located, from what ive heard, in the back right corner of our trunks. I have an 06 3.6. My specific questions are, do we lose the "Voice" button on our steering wheel? If so can we not reprogram it simply by editing our setup? Or is it more difficult. What is the cost? And is there a specific model we need for our CTS's or does one unit work for all gm models between certain years, and another for other years. Are there any good write ups on this item? Thanks all, hope to do this mod soon but figured id come ask my questions here first!