UKPassats

Now I don't listed to the radio that much, however when I do I don't want the signal to be interfered with by my HID's. I've tried ferrite coils, not much success. I haven't as yet grounded the ballast to the bodywork which is my next thing to try.

I've read about covering the ballast with tinfoil but it sounds a bit daft. What other solutions have you guys done?