I have a 2008 with Nav and wanted to have bluetooth connection for my phone while still retaining all of the stock features. So what I did was install a newer steering wheel from a Centennial Edition C6 that had the phone buttons on the left side, (These buttons are already wired into the steering column harness with the existing connections, so it's just plug and play) Then I found on ebay an OnStar Control Module from a 2013 ZR1, This replaced my existing Onstar module in the rear passenger side location of the car. From 2009 on up the c6 has Bluetooth, so as long as the module has the Bluetooth logo. and same connectors it should work. Only thing is that the Onstar module will still have the vin associated with the donor car, but I'm not concerned with that, since I'm not using OnStar. 2 cables and associated wiring harness plugs on the original module, the replacement module from the ZR1 has a Bluetooth antenna, and 1 cable connection. The 2nd cable connection from what I understand is for the Onstar gps. so I just left it unplugged. I had to make a simple bracket to mount the module since It didn't have the bracket cast into the housing. Just used some aluminum strapping. Here's 3 pics. 1 of the steering wheel, 1 of the back of the 2 modules and 1 of the front of the 2 modules showing the original part number and the part number for the ZR1 module. Great thing is that the display on the dash shows the incoming phone number and all of the associated info. that the newer car would show. Radio also shows all of the info and the volume of the radio turns down. It's essentially upgraded to a newer system. Even the onstar light on the rearview mirror has stayed green, some internet comments said that it would go red. Anyways. for approx. $500 and an afternoon. My car has been updated to an OEM handsfree set up. Next step is to find a newer nav radio with the usb connection. Then my phone can play music through the nav unit. But I'd rather have the windows down and listen to the car, so that's not a priority for me right now. But the hands free is definitely the way to go when it comes to cell phones.