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Funny, just did the thermostats and hoses on our Sierra. Since access thru the passenger wheel well makes it easier job for a few of the clamps, I was in that area. In which the Duramax air intake sucks thru. While running the truck at idle doing the coolant fill process, I noticed a deep distinct lopey sound from the air getting sucked in.
I have a stock intake but a AFE filter installed. The stock filter was much more quiet.
Point is, definitely stock filters have more restriction. These diesels need air and the turbos at full spool really need the airflow. So I would not doubt you have some free horsepower on tap that was restricted before
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