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Pop/Tap/Loud Click? Noise when letting off the gas

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Location
Santa Barbara
#1
My 2015 started making this noise when I let off the gas to go shift, almost all the time on almost every shift. At first I thought maybe there was something wrong with my Stratified tune that was making it backfire, but I don't think that's it anymore. It's so consistently just one single pop on almost every shift, and it didn't stop when I uninstalled my accessport and went back to the stock tune. Also I did more testing, and it doesn't seem to do it at all when I'm standing still (either in neutral or with the clutch in), no matter how many times I give it gas and let off, pushing the clutch in or not.

Any ideas what it might be or where I should look? I'm running a CP-e RMM and have been for a while now. Other than that it's pretty stock. I can try taking a video and uploading it.
 


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