I recently purchased a 2002 S430 and i did not purchase the HID lighting upgrade, but I was thinking about adding an aftermarket upgrade. Is this advisable? I heard somewhere that my seals will leak, or something like that. Is that true? Also where should I have it done, (I live in LA by the way)what is a good quality manufacturer of them, and what price range am i looking at? Would it be cheaper to have the dealer install it or will the dealer even add this option on for me? (I heard somewhere that dealers don't do lighting upgrades)<br> Can someone assist? Thanks!