I've got a weird issue that's been happening for a while, I just haven't done much about it. Off the throttle, I think it's too rich & fuel is passing through into the exhaust and goes BOOM. This isn't decel gurgle. These are BOOM's. With ear plugs in, it's loud enough to be unpleasant.
Model year 2015
Full Akro
2WDW flash
Valves adjusted after this started happning, no change
Throttle bodies synced at the same time, no change
I install exhaust in 2017, had it flashed in 2018. After both of these, there was only the tiniest amount of decel gurgle. This started in late 2019, early 2020. Therefore, I don't think it's an issue with the flash or exhuast, but something is loose or broken.
Things to check?