well..since i do have a boost gauge in my GT..so I can tell how much boost you have, with my stocker, before with castrol 5W30 for the break-in period..seen 0.85~1 bar (14.7psi=1bar)..re. saw 1 bar reading at shiftup, right after releasing the clutch n slam on the gas ..now with the elf 5W40 it's steadily with in 0.8~0.85bar
if I remember right...cobb's set the stage 1 map aimed the peak at around 16psi
alan