Its a hassle on any car, I do them on the side. I have prepped my GTO but haven't made a decision on brand yet. I prefer 2 way systems myself and will probably ultimately go with the zenesis 502. DEI (viper) doesn't support DIY & freelance installs anymore, DEI systems don't come with full paperwork and there will not be a warranty. I suggest you get some help if you don't have strong electrical capabilities. I have detailed notes on mine and can help you through pm's or this thread if needed.
2005 CGM/M6 cags delete, hardwired radar detector, Hawk pads, Remote start, LS7 clutch, Traction control default off/Cruise control default enable, HID lows. More to come, maybe...