If it was a compressor racing hy it would have been the 10cm exhaust housing ..
I've read 28 psi is the danger zone and you need a sleeved block
Running 2 bar has got to be in the 500hp range .
did you use an oil feed restrictor , and what did you do with the water lines for the stock turbo , block them or joined them?
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Here's what I'm doing with mine,
As I'm mounting it flipped or reversed not sure what you'd call it (check pic in post #1). Getting the output from the turbo to go under the intake manifold means the exhaust will be very close if not touching the brake master cylinder.
Here it is with a Vband 2.5" tight 90 bend into a 3" . I think the 2.5" will be restrictive as well..
Internal wastegate fully open , totally useless will get boost creep me thinks:) so external is a must.
So I don't need the internal gate and I need to make it all a bit shorter and flow better . I've killed 3 birds with one stone.
Got the hacksaw out and started cutting , took an hour,,
Now its a bit shorter and I can weld a plate on the wastegate hole. Use a 3.5" tight 90°bend , Vband it on the bottom for the down pipe ,which will also be 3.5". should improve spool up and flow and it will sound epic,,, just need to weld it all up..
It still might not fit and I may have to go rotaded,,