So I have a 2000 civic si and some days when I go and start my car mostly when cold it's will put off a loud screechy/squealing noise untill it warms up and sometimes when decelerating mostly when then cars cold. Doesn't do it all the time but somtimes. I've noticed my alternator belt is a little loose so I'm going to start there. Also car is boosted so there is no a/c or powersteering. Just seeing what else it can be.

 

Check belt tensions. 94