Hey guys I have a quick question...I have a 2002 CLK 320, and it only has the halogen type headlights. I was wondering can I change the whole headlight unit with a HID headlight unit? Is there any thing else involved? Wiring, computer alterations? Any help is appreciated.

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1987 300E
don't laugh but want to get a 99 modded civic SiR.

BTW BMW SUX