so after mucking around figured it out.
the instructions from here
https://www.newtis.info/tisv2/a/en/f...nit/1VnYX8ir4E were useless to me as my rear seats do not move.
First step is to unscrew the bolt circled in red in the first pic. then use a trim removal tool to pull down the side trim. there just a few clips that you'll hear pop as your pulling away. you actually don't have to remove it all to access the amp as seen in the second pic.
i upgraded to a Match Up 7BMW amp. I still need to load a custom tune, but it made a huge difference.
https://www.audiotec-fischer.de/en/m...ifiers/up-7bmw