Box above coil packs

[PJBB]

just lookin for some information. I will sound stupid but what does the box do in the picture that's above the coil packs? Is it needed as I would like to have my coils on show you see.

Thanks in advance

[SuperbTWM]

I think its a vacuum resovoir

[Liverpool-Lad]

Correct

[andy68]

It's some thing to do with either the SAI, N249 or N112 can't remember which, I junked it all at the same time.

[DaveMW]

Bin it and do then do the n249 bypass.

[dubDEAN]

so this is linked from n249? as hate this thing :p