What is this??

[Arfa Brayne]

Hi all

What is the item circled red for? I know it's some sort of air valve/regulator of some sort, but what purpose does it serve? Reason I ask is because there is an annoying clicking sound at idle and I believe it may be this item.


Edit, this is the intake off a tb42e.
Thanks for looking

Andy

Chasing the same answer to the same question - what is this valve for. Is it a "deceleration control valve"? - trying to rid as much clutter from around the engine as possible, plus I'd like better engine braking.