Our 525iT had the extra pair of forward facing speakers (but no sunroof). I considered modifying the rear headliner but couldn't find the exact trim pieces needed in the ETK to support 4 speakers in the rear.
Considering how infrequently I'll be in the second row, and my desire not to alter the interior much (I guess I'm not confident) from stock, and the advice I recieved here, I put my money and effort into the front speakers and just put coaxials in the rear for fill.
-Matt P
'99 540iT
Those pieces are in there. I was afraid to cut those in also. When winfred was breaking a touring many moons ago I bought the headliner and the left CD size interior door. My stereo guy thought my headliner was cleaner and he said there were indentations for where the forward cutouts were supposed to be, so he just cut them my oem headliner. I've been pretty serious about retaining the stock look (other than clear markers), so I kept my headunit and put the cd changer back where it lives normally, but I have all new speakers behind the stock grills, the 5 channel amp under my seat, the eq in the glove (w/ipod aux input) and the plug and play sub.Originally Posted by Matt P
here's my write up again
~6 speed~ Rear Fogs ~ Shadowline ~ Tow Package ~ OEMMM///S38B38