(if you know what you are doing, haha...) Or you can take it to EARMARK at Dallas (one next to tollway) and Jerrad, the installer, would take a very good care to install things on your Z. He installed my alarm and he just took time to do it and make sure things are neatly completed.
I have compared all 4 EARMARK in Dallas area, the one in Richardson/Garland charges a bit less on labor while the other 3 location charges about the same.