Outer Limits 4x4 Board

I have a 1998 GU 2.8LT Diesel. It has a mod on the turbo where the waste gate valve has been welded to a fix posistion. On the tubing for the valve comming from the intercooler to the turbo is a T-peice adaptor with some sort of bleed valve is fitted. Has anyone heard of this mod and its purpose. As i have just had a cracked head replaced, should I remove this mod and return it to standard.

I would return it to standard !
Maybe up the boost a little, but no more than 0.8 - 0.9 bar.
Btw. GET a boost gauge !

pull it out and fit a v8 350 chev to it ..... (serious!!)

the 2.8's are a very weak motor and like the 3L GU's there a ticking time bomb ready to nuke themselfs !!!