Okay here's the deal. My friend has a 6.4 that has 250k miles and has been a reliable truck. Now he was in Manitoba during that severe cold spell and on the way back to Nebraska his boost was running higher than it should have been for the amount of load and or throttle input. He is running H&S tuner with straight exhaust. Now he says it builds lots of boost with it just in neutral. Like 20 lbs. Now he took the turbos off and they look and spin like new. Nothing is plugged up. He's checked the cac and it isn't blocked either. Exhaust is also fine. Does anyone have ANY idea? Thanks
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