I have the ML w/NAV and I installed the usa spec bt45-toy and it works like a charm. Took 15 minutes to install. Bluetooth connection is solid. Streams music perfectly, audio quality is amazing. When you are listening to the regular radio stations it will automatically switch to the bluetooth to receive the phone. People on other end say that I'm loud and clear and can't tell I'm talking in a Bluetooth microphone. Only minor drawback it has its the phone call volume. You have to turn it up a little bit to have a good volume and then just turn it down after the phone call is terminated. It doesn't both me much. I highly recommend it.Will this work with a 2005 Nav/ML setup? Very interested, I need someway to hook up my phone.