Bit the bullet and booked my patrol in for an intake clean, 3" exhaust and ecu remap with egr delete and manual boost control.
The beast is currently sporting a standard exhaust and a "ChipIt" performance chip, which is how it came to me 2nd hand. This setup makes me nervous while knowing all well about the high EGT's these vehicles produce from the factory.
My main interest is reliability and longevity. I look forward to sharing my results :)