does anyone know wat size is the speakers in the back??? and wat size are the speakers in the door panel???trying to hook my baby up wit some new sounds...cause mah system blew out...and im going for a whole new set up...

What year is your Impreza? If it's an '02 or newer it's 6 1/2" in front and 4" in the rear doors although a lot of people put 5 1/4" speakers in the rear doors by making a spacer/adaptor. The depth in the front doors is critical as very few speakers will fit in the front doors without some kind of spacer. I put in MB Quart RSC216 seperates using a 7/8" spacer.

i have a 2001 impreza 2.5RS

Go to crutchfiled that is what I do when I need to find out sizes.