i can only assume they're kind of a remnant of standardisation. they're not visible in my 4.8 and i'd hazard to guess they're holding the air box on N62s, while being somewhat obsolete on your N55. but that's just a guess.

googling images of E70 engine bays with N55 and N62 engines it appears to be the case. still, i'm really only guessing.

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