I can't say I have noticed any real delay on the horn but one thing I have noticed is a delay when flashing the headlights, to the point where it is almost impossible to get a decent short sharp flash or two.
I suspect it is to do with the Adaptive BiXenons I have as it appears that something is moving inside the headlamp to achieve the flash instead of the more normal lighting of the full beam bulb.
Anyone else notice this with Adaptive BiXenons with HBA (not in the US as your headlamps are different)
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