Okay, i find this interesting and hope it works like charm.
Do It Yourself (DIY): Stereo Bluetooth (A2DP) on the SP5 HTC Tornado + some other Windows Mobile 5.0 phones
another guide on Dopod 818 Pro: forum.XDA-Developers.com
another guide on HTC Tornado: forum.XDA-Developers.com
Have fun, be aware that, you will be doing it at your own risk.