Forgive the cell phone photos and unwashed car. My wife has the digital camera right now and it has rained a lot the past few days here.
For the bargain price of $389 installed I got the rear sensor package put on my G8GT. I have missed this feature from my LaCrosse CXS quite a bit.
The speaker unit has three settings Off, Low, and High. The manual recommends Off for trailering or mounting a bike frame on the back. The manual (2007) features a digram of a Holden Monaro/Pontiac GTO for the example installation. The speaker is velcroed to a post forward and above the battery.
All that is left from GM accessories that I want is the splash guards. They have been on order for like three months now. I may put on that chrome gas cap in a year or so too.