Re: overboost /fuel cut.....
Sounds like you have a leak somewhere or a sticky boost control solenoid.
Gatwick shouldn't of changed the restrictor without investigating as it's likley due to a fault/leak which the change in restrictor has masked.
Are you still running OE boost control ??
The boost control pipes should be plumbed as per my post to CJ which I have copied below :
Standard 2-port plumbing :
turbo to T-piece (restrctor in pipe)
T-piece to Actuator
Bottom branch or T-piece to Boost Control Solenoid
Then Boost conrol solenoid to inlet manifold (the little black elbow just to left of main induction hose).
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