Need help adding a 5ch amp with singnal processer to my factory HU???

[TBelt]

Newbie and sorta stuck here. I've searched high and low for the answer to my question before I ask. I am trying to figure out how to correctly install a Audio Control Lci7 and a 5ch amp?. I have a 2016 Chevy 3500hd 6.6 Z71 w/ Bose system w/bench seat, no subwoofer. Ive heard of tapping into the Bose amp wire harness for all my high level inputs? I can't be sure but I was wondering if somebody could point me in the right direction so that I only have to remove my rear seat 1 time. I want to do it tright the first time. Any info would be greatly appreciated.

[xps800doo]

i talked to pac audio today, and they have a interface coming out in the next week or 2 (ap4-gm61) it will plug in behind the radio and give you 3 pre-outs and a remote turn on lead, the bose amp stay's in place and you use the factory wires going to the speakers, (from the output of the bose) or you can run new speaker wires from the amp. all for the low price of just 299.99... kinda crazy in my opinion but cheaper than replacing the factory head unit i guess.