iamdub
Full Access Member
There is RPO BS1 acoustic package that the Denali and Escalade have, but the LTZ does not have. Taking the Escalade out of the equation (different dash and door panels, and 2011 and up have laminated front door glass), the only difference I see between a Denali and LTZ are the door panels. The Denali has vinyl in the upper door insert, and vinyl on the door handles that also surround the window switches. Other than that, I don't see what else this 'BS1' code is.
Thanks for that info! I recall once when I had my door panel off that there were a few pieces of sound dampener "tiled" around on the backside of the door skin. I should've taken a pic. I also noted a piece of dense foam behind the sail panel to insulate where the mirror is secured.