you need to do a LOT of hollowing out. gm put a cubby where the stereo goes.
as for the rear speakers, you need to use a pair of needle nose pliers to remove the center part of each push pin that holds the speakers in. dont break these, as gm charges an astonishing $4.00 for EACH ONE!!! and its next to impossible to find any at any parts store.
here is a picture of my cubby in order to fit my stereo. once i got an amp and had to run RCA preouts, i had to remove the duct looking thing. there are about 50 wires running thru that duct, so be careful if you need to cut it out.
6000k headlights, LED license plate fog lights, tinted taillights and to top it all off, 2 12" air horns!
the gf:'00impy 3.8, every option. COTM July 2013