It is an 07 G6 GT Sedan (4 door).
I am not sure fully how I want to wire everything. I have a RF 3Sixty.3 DSP and I have a shallow chassis Kenwood eXcelon DD head unit. I have It wired in the 08 GT so that it retains the Retained Accessory Power like factory but I lost all the functions the factory radio has like oil life, door lock settings, Trip meters, MPG and distance stuff, security stuff. I know Metra has a dash kit that retains most of that stuff I think. I am probably just going to hook up the Kenwood how I have it now and run my Knukonceptz Krystal RCA's to the trunk into the RF dsp and out to the amps. I may hide the mids and highs amp near the factory Monsoon amp and use its wires to get to the front components. For that I would hard wire in from the outputs of my Soundstream Rubicon Nano which is so far much better than my US Acoustic amp. This little thing just doesn't give a f#*k!! Bumps, Heat, Running full tilt... it barely gets warm.
The car door panels rattle.... noting a proper sound treatment couldn't fix. I know in the coupe the sun visors and sunroof are pretty buzzy with the bass. The coupe also rattled the back deck. I overcome all that by just turning it up louder.
I use an Axxess brand wire harness for the radio and the brain to retain the R.A.P. I had no issues with door chimes or head light reminder chimes.
https://axxessinterfaces.com/