H3 install locations help

[knights]

if i remove that monsoon amp/sub will i lose the onstar and other features even if i use the onstar and chime. a GM licanced installer said that it would happend, altho i have no intention of paying there rates, still like to conferm it be in the 2007 h3x i have on order but im assuming its the same system he said it be onstar 6.1