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search acoustic valve on here, you will be enlightened! it reduces noise in the air intake to comply with swiss regs, complete waste of metal/plastic a lot of people pull them out me included!
could have been re-routed due to a clutch change or something. and then the mechanic put everything back under the battery but forgot that and could be arsed to take it all back out again. As said, if it works then leave it.
As above its nothing to worry about and its nothing that needs to be fixed under warranty. You can easily unplug it and re - route it yourself but its not going to cause any damage how it is.