Apparently you need this overpriced door chime adapter in your truck when you install an aftermarket receiver in order to pass inspection. http://www.crutchfield.com/p_120GMR...-Adapter.html?tp=3486&tab=review&rvm=ShowAllt But I have read and heard that the adapter is not necessary for inspection. Any clarification would greatly help, as I don't want to drop $80 on a little circuit board and some wires. Thanks!!!