Honestly those look horribly designed, does everyone flash their high beams at you? They aren't even trying to mimic the filaments of the halogen bulb.
I would ditch those and go with the Beamtech if you really want led bulbs. It's too bad Diode Dynamics hasn't released an H13 LED bulb yet, but supposedly one is in the works.
Noise in the stereo when those are on is due to insufficient or failed filtering in the bulb assembly. Could just be one of them causing it. You could try hooking one up at a time to see if only one of them causes the interference.
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