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looks like what Honda calls cover assembly, engine, lower.
this part is for aerodynamics, it smooths the bottom of the car for less drag.
thus improving fuel economy.

the part number 3 blew down on my car a few months ago. interestingly this happened not long after an oil change.
anyway, I left it (#3) off and have not noticed any noise or reduction in fuel economy.

i'm not saying that you should take it (#2) off and leave it off.
but it is an option...

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