My BA turbo ute that usually has 10psi and 290rwkws has dropped back to 7psi and less power. It has injectors, valve springs, monza cooler, hi-flow cat, ubp, plazaman piping kit, cai and normally goes well. Recently it lost power but still runs well (ie; smoothly,starts well, revs cleanly). So I checked all plumbing, new gapped iridium plugs, new air filter, lubed boost solenoid. No difference! I recently trailered my son-in-laws Calais (that felt good) a couple of hundred klms, but not too quickly. The problems started around that time. Is it likely the catalytic converter has gone to greener pastures? Any other likely causes?