Big Picture, not sure if you thought about this - keep in mind - dont want to scare you - fuel pressure issues are particularly "dangerous" on turbo cars. If you are driving aggressively on boost and the fuel pump does not deliver the goods (fuel) the cylinder charge can go very lean very quickly. Very lean = detonation and potential damage.
I imagine the computer is smart enough to detect a lean condition very well and quickly but no where near like a modern car.
So be aware of this potential and if its missing or you hear pings or something is not right stay off the boil until you can diagnose.
One issue I have read about here and have experienced on other cars. The fuel pulsation dampener is just above the fuel pump in the tank. This apparently gets old and allows pressure to bleed off. Normally the failure manifests as hard to start because the fuel bleeds off when the car is switched off. Replacement fuel pumps for our cars come with a "pulsation dampener delete" (its a piece of hose). I can imagine that if this plastic bit was really coming apart it might allow pressure to bleed off and cause problems with fuel pressure at high RPMs and boost. Its hard to imagine you would not also have hard start problems but keep it in mind. And if you do end of changing the pump delete the dampener.