Just a pic of the new Nizpro exhaust, which we should start to get in stock shortly They will be available as 2 models, 1 to fit BA and BF turbo sedans and the 2nd to fit FG turbo sedans. More details to come shortly
Depending on your tuners dyno, he may have the duty cycle figures logged and can let you know, but I would think at that power level, depending on how rich it is etc, they would be getting close to maxed out
39 lb is close enough to factory size that the car will probably start and once it goes into closed loop the ecu will almost get it back to stoich, but if running too rich it may destroy the cat fairly quickly. If your fuel pump hose was leaking in the tank, your pressure may have been down so your injectors would not be supplying the correct amount of fuel, which may also explained how you got away with it.
you wll need the actuator replaced to make 15-16 psi in the top end to get your power figures and with the gear you have listed if you add an actuator it will probably overboost so you may need to port your turbo, I'm sure Dave will explain all this to you.
Buy a set of pre gapped plugs to .8mm and you should not have a problem with them, boost will need to be pulled down in the top end as injectors will be maxed out at approx 4500 rpm with 12 psi
If it was a exhaust housing bolt that was loose, you may find that the housing has a crack into the thread hole, if this is the case it will continue to come loose.
your base figure is close to normal for an auto, but normally injectors are the first things to stop the power party and it is normally around 240 rwkw+ for an auto
Early BA will run on 91 but will be down on power a little due to knock retard, later BA's and BF's say minimum 95 but even this may cause slight power loss