The stock vct gear is adjustable, but from the back. You have to take it off to adjust it.
I made a thing so it can be adjusted from the front, then found out it had already been made by others years ago and isn't much use anyway.
Nothing. Except for maybe it being in backwards.
Either way you aren't going to be able to fox it from the outside. Face the facts and whip the box out.
4 inch isn't a volume. It's a diameter.
The silencing ability is determined by the mufflers, not just the pipe size. I've heard some loud 3 inch exhausts, doesn't mean they all are.
You can't hear an internal wastegate. So the noise you are hearing needs to be explained.
Look at your gauge. Is it in psi?
Also, why did you buy it if it doesn't feel right?
Based on the above quotes I am confused?
What vct feed in the block? The 30 block doesn't have a vct feed.
For reference for others, the 30 gasket is correct for the 2530 setup. The 25 won't seal by much around the coolant gallery around the front. It is only a few mm.
As said there is no problem on a properly setup system.
If your tuner has already had issues with one they setup then I wouldn't let them set yours up. Unless they simply had issues tuning someone else's dud setup.
I wouldn't use that turbo if I was paid to.
Read the rb25 dyno results thread in the forced induction section.
Look hard at hypergear Bolt on options. They are what you want.