I'd like to install an aftermarket alarm but I am concerned that it will cause problems with the Guidepoint I had installed when I got my Z. Ok, I probably should not have got it but I had a car stolen before and I'm now always paranoid. Anyhoo, I'd like to replace my stock alarm with something nicer. Does anyone know how the Guidepoint works? Is it somehow connected to the factory alarm and would it be a pain to have it co-exist with a new alarm?