You should not upgrade to a 3.5 bar FPR unless you are doing ECU tuning at the same time to compensate. Otherwise your injectors will be putting out more fuel than desired.
Is there any chance that the wiring to the front and rear O2 sensors is swapped? When you start the car, the ECU runs fueling off of a cold start map. Once the car warms up, it goes closed-loop and fine-tunes fueling based on the front O2 sensor. If instead the front O2 wires are connected to the rear sensor, that sensor will not be a great location since it is after the cat plus there might be upstream air leaks. They also might be slightly different sensors on your car. This might also explain your rear O2 sensor CEL.
I can't recall what a T5 ECU will do if you disconnect both O2 sensors. You might want to try that...it either won't start or it will throw a CEL but hopefully fall back to an alternative open-loop map. If that eliminates the bogging issue then you know it's an O2 sensor issue.
Usually fuel pump issues are hard starting and weirdness at the top end where the pump can't keep up with the injectors. But who knows.
posted by 64.134.228...
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