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Its known as car / key memory and there are various settings that a dealer or an independent in possession of the key programmer can program for you.

Iv heard that they charge around £30 for up to 3 settings…but prices can vary among dealers.

I am not sure where you could get this tool from and what it involves to set up and what type of computer software you will need for it.
The dealer is able to print out your cars full list of options and show you which ones are enabled.

I don’t think that they can change the volume level of the siren. They can make it bleep on activation/deactivation and also make the lights flash too.
I don’t see why you cant change the siren for a louder one and integrate it into the stock system.
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