No alarm on mine but the normal horn is really loud. We had a friend's kid in the front seat (car parked and off) and he hit the horn button. The reaction from his Dad was great. 
I feel like Jeremy Clarkson with the Merc Grosser limo getting into the horn race in the parking structure.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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