I'm looking for something that will charge my 521 and play my music through the cars speakers. Anything out there?
You can buy that stuff literally anywhere. Newegg, Monoprice, Amazon, Homegoods, Party Store...
P.S. If your car has bluetooth you can connect to the phone with that.
It goes something like this: There are two main profiles that a Bluetooth device can have when we are talking about the use in a car. There is a phone profile and audio profile. Some cars come with one, some with both and some with neither.
Now, assuming that you do not have Bluetooth system that is integrated into the car already, or have only one that does phone calls - so the phone connects to it but you can not play music - then you will need a device that receives audio over Bluetooth and transfers the signal to the car stereo system. The best way to connect is to use what is called auxiliary or AUX input on the stereo as it is a wired connection. If your car has a small headphone jack it is likely the AUX port. If the stereo does not have the AUX port, it might be relatively simple to add. Look on Ebay or Amazon for the AUX harness for your car make and model and see what you find. Another possibility is that your car HAS an AUX port capability but it does not have a plug, in which case you can just buy that. Search for a forum for your car that usually has people that talk about this extensively.
If a wired AUX connection is not an option, then the other option is to get a Bluetooth receiver that then transmits a signal to your car's radio over some FM frequency. Its like running a small radio station for your car only. The drawback is that FM transmitters will usually mean some loss of quality but if it is the only option then it is probably a good option.
Oh yeah, you could also replace your cars stereo headunit with the one that has AUX and/or Bluetooth built in.
I have had some experiences with the AUX port plugged units.
For my car, which has no factory BT, I used a unit called Kinivo BTC450. It plugs into the AUX port and power (cig lighter port). Works great. I have to put my car stereo to AUX input and then I have calls, music and all through the BT.
For wife's car, which came with factory phone BT profile, I bought a Blackberry Music Gateway. Excellent quality and sound, like the Kinivo. So her phone connects to two devices - factory BT for phone and Blackberry for music.
What I like about both of those devices is that they do not have internal batteries so when I turn the car off, they are gone. When I turn the cars back on, the devices are powered, phones establish the Bluetooth channel and it is all just on seamlessly. I do not need to touch phone nor the Bluetooth device to turn them on/off or pair anything.
Oh yeah - another thing: whichever way you go, do yourself a favor and get a $10 device called Ground Loop Isolator. It plugs serially (so my Kinivo plugs into it and it plugs into the AUX port) and it gets rid of the buzz that many car's electrical systems create when an audio device is plugged into power and charging. It does not matter how expensive your car is, most car power suffers from this, do yourself a favor and get it when you get a BT audio receiver thing.
My car does have built in Bluetooth and am able to have my calls and txt go through it just not music.
Then you need something that does the audio profile only, like the Blackberry Music Gateway device that I use in my wife's car. It will then show as a different device that phone will pair with and will connect to two BT devices at the same time.