The Viper 160xv is the Unit. Do Have the Chipped Key, if you do it will require a transponder to be wired in. if not the 160 is a standalone unit. . the unit is about $100. 00 the install WO/Transponder $125. 00, W/Transponder $250. 00 Installed. If you don't know how to read wiring skims or familiar with the system, IMO don't attempt it.
On edit. . The Module needs to be programmed, the 160 requires the 998t by DEI, but it only takes 5 minutes to do.