I don't have an aftermarket system (yet), but do have a Piezo siren that I would love to hook up. Now I don't want to just hook it up to the horn, otherwise I'll go deaf when honking at idiots. But if there's a wire I can tap into so that when the factory alarm goes off and triggers the horn, I would use it to then make the siren go off.
Or perhaps I just need to get that viper alarm with remote start I've been eyeballing.
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