Oh F! Bose Question In Denali.

Ok here's what I'm trying to do. I have a 04 Denali with the Bose system in in with the navigation etc. I have 1 12" RL-P and a directed 1100d that I want to install without doing anything else to the system. What do I need to be aware of with this. I just want additional low end. I know, I know Bose *****, but this is what I have to work with.

Any advice would be appreciated.

Thanks,

Austin