PAC OS-311 Onstar Interface for 14-PIN and 16-PIN GM Vehicles 2006-2008 Gm 11 Bit Lan Data Radio Replacement Module. Retains Onstar And Bose/Non Bose Audio System Retains onstar Retains door chime Replaces factory radio in GM SUVs & trucks while retaining OnStar Plug & play, no cutting or splicing into factory plug On-board amplifier will drive two 4-watt speakers in stereo Use with the existing factory speakers or external speakers OS-2/OS2-BOSE communicate directly with the OnStar module to prevent false triggering and eliminating unwanted audio noise