Acceleration Screech.
 

The past two days occasionally the car will do a quick and short screech when I get up on the throttle, serp belt replacement time? 65k miles, recently installed cai.

Sounds like the belt could be a little loose. Doubt you're confusing the supercharger whine for a screech

Spin all the pullies by hand first to make sure one of those aren't going bad

No, I know my supercharger whine from a belt slipping. It sounds like when someone starts up a ratty car in the morning and you just hear the screeching, but it only does it when I give it a good amount of throttle while already driving, and it's only for a second. Only heard it three times so far.

X2 Could be belt tensioner going out..

The idler pullies seem to like to have issues.