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Yeah I looked again here in the last week. Unloaded I'm 60-65 but when towing my empty 24' gooseneck trailer I hit about 75% flooring it up a hill. I was a little surprised.
and you still hear the slight air screeching sound under full throttle? specifically its easier to hear cooler than warm which is why its an interference miscalculation between the intake pipe and the filter. the quiet mid-high range intake howl happens under partial throttle. Still frustrating compared to how quiet/engine focused the sounds are from the duramax.(I had one in my LMM, only sound i head was turbo whistle quietly which didn't bother me. My buddy has a 2016 Duramax, haven't head any air related noises)
edit: our unloaded boost gauges are similar/same then.
Turns out it was the waste gate. Brought it into Ford for a tech ride along. He said its definitely the waste gate. He also mentioned that the 11-15s were significantly louder.
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