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even know i have a cummins and a bigger turbo im at 12psi at 70 in 5th even with the stock turbo i was at 8 or 9 dont know why a duramax would be any different
it all depends on the load on the motor.....I see as low as 3 lbs on flat ground doing 65-75 mph
Same here on flat ground just cruising no load no wind I see very little boost at 70. Slight grade will give some boost and a good hill I might see 10lbs.