Well, I'm going to go down this rabbit hole over the next couple of weeks and do some overkill with it because I'm a little curious and interested. My brother used to do a bunch with acoustics, so I'm going to give it a go.
I agree that it's pretty quiet in the Denali. I don't have much in expectations going in, but I'll see what's there already. The one thing I will say though is that when I'm in the Denali and using my bluetooth headset (vs the in truck mic), it picks up enough wind noise that it's ANC distorts my voice so that people on the other side cannot clearly understand me. When I'm in my wife's Acura, I don't have this issue. I'm sure it's nothing and I'll make little progress here, but if sounds like a fun project.
Are there better mics than the stock mic when using bluetooth in the Yukon? Even that one sounds terrible on the other side.
Are phone app dB apps accurate enough to do a before and after?