G60 question

Really getting there with the g60 conversion, pretty much have a running and driving car

I have one question though that i can't seem to find the answer on Google. There is a little outlet on the throttle body, below the pipe that runs from the intercooler, you can see it in the below pictures:



My question is do I just plug this or is there meant to be a pipe on there to somewhere? When I block it with my finger the car runs fine but there is a high pitched noise,

Thanks in advance 

Blank it off. The noise is probably air passing through the boost bypass valve, which is ok.

addicted said

Blank it off. The noise is probably air passing through the boost bypass valve, which is ok.

  ok cheers, do you know what the purpose of the pipe is?

It was connected to the carbon canister, along with the small pipe on the back of the throttle body..

addicted said

It was connected to the carbon canister, along with the small pipe on the back of the throttle body..

Thanks