mid 30's , seriously though boost is load related, if you are just cruising down the highway it will be low (low load), if you floor it the boost should climb (high load). on board?

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1996 s10 zr2 with a 6.5 turbo diesel
1996 c2500 suburban with a 6.5 turbo diesel
1981 300sd with a turbo 617
Monte carlo figure 8 car