I bought a 2006 Lacrosse that came with an Astrostart remote starter system, and no factory remotes. I was curious if I programmed a factory remote, would it work (coexist with the aftermarket system), kick off the aftermarket system, or not even work at all?? I got the car used with 2 keys and only one remote. The Astrostart remote is terrible- you have to hold the buttons for like 3 seconds and they are all really tiny. SO, if I bought something like this: Amazon GM remote and programmer would it work? Anyone know if an aftermarket remote start system can coexist with a factory remote (to be clear, I wouldn't buy a factory remote with the remote start feature. I know that wouldn't work. I just want a 4 button remote. )