It seems like most of the car alarms I set off with the Cobra exhaust, only do their thing for 5 seconds or so, then they shut off. Last week I set one off that went through the full cycle of a multitude of different sounds. The car was parked a hundred feet before a red light so my wife and I sat there at the light listening to this stupid thing making all kinds of sounds. The light finally turned green, we were off but that alarm was still going. Hope he had a good battery.
Wayne