I think that's the pressure feed to the wastegate actuator, and the little metal thing in the foreground with the two small pipes going in the top is the solenoid that controls low/high boost levels.
If I'm right and you just remove that pipe (or remove it and blank off the little bit sticking out of the induction pipework) then you actuator will never open your wastegate, your boost levels will go through the roof and your engine will go pop.
this is on my black car , completely diferent , no restrictor thing ,the blitz is not conected at all . It boosts to just past + 0.5 , but feels much slower , there is also a kind of chuffing noise on boost . This car also has a after market comp .
any sugestions ?
The R33 GTS-T's have a two stage boost system to help keep the power under control.
stage 1 boost is 0.5 stage 2 boost is 0.7.
What I would guess is that the balck car has had a boost controller fitted at some point and when it was removed not all of the original pipework was there to replace. so it is now only boosting to stage 1 ie 0.5.
if you look on www.skylinesdownunder.com and search for free boost upgrade you will find more information on this pipework and the restrictor therein.
my recomendation however would be to get a boost controller fitted and set it to 0.8
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