I want to replace my siren on my car, it doesn't seem as loud as it once was, especially compared to other BMWs. I went to a local junkyard, and they showed me 2 different kinds:





The bottom image, part number 2 is what is installed on my vehicle right now.

What I want to know is are these both the same? I have anti-theft on my vehicle, and I know that there's an inclination sensor built in to the siren, does the top one have that too or is it just a siren? Would I be able to buy and install the top siren onto my car and still have a working anti-theft with inclination sensor?

Is there a way to increase the loudness of the confirmation tones when I lock/unlock the vehicle? I would appreciate some insight!