Well, my new car came with the factory alarm system. It was set to honk the horn when you arm/disarm it. I figured that I could change it to chirp like my brother's M5 but no luck with the dip switches. Then I searched for the siren and couldn't find it. Could not see it anywhere in the engine bay or near the firewall. I turned the sound off and figured that would be fine, but I really like having an audio or visual confirmation. So my question is this, can I add a siren (factory or aftermarket) or relay to make the parking lights flash? Which is easier or cheaper? Anyone with experience care to chime in? Thanks in advance.