in front of the UIM there is a big black box which i assume is a vacum chamber (has 2 hoses going to it on the right side). i tried blowing in the nipples and it seems that air travels freely both ways. can someone tell me what this chamber is for and if its alright if i remove it ?(just connect the two vacum hoses directly to each other). thanks

 

The black box is just an empty box that stores pressure/vacuum and is used when needed. If you remove that box then your turbo system will not function properly.

 

It is a PRESSURE chamber that stores the pressure required (8psi) to actuate the Turbo Control Valve (TCV), and Charge Relief Valve (CRV)

 

ok cool, guess im just gonna leave it then. thanks guys