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I hear a distinctive knocking sound when switching from low to high beam. Is this normal? Has anyone actually installed different after market headlights? What have been your experiences with these?
 

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I haven't noticed any knocking sound in mine but I haven't really paid any attention.

A few possible (normal) causes would be a high beam relay (which I bet is what you are hearing) or the stalk clicking.
 

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I noticed it too.

And I went out and looked at the headlights while my wife flipped the high beams on and off. Something in the headlights moves. Looks like a lens or something between the bulb and the outer transparent cover.
 

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This is normal. When turning on the high-beams the light shades actually flip up. You are hearing the mechanical function of this action.

I like this unique functioning, as it seems to match this unique car.
 
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