well, i got a little bored, so i came up with an idea... your chasing a car down the road, but they dont notice you... aha! a horn! so i rigged my hyper with a piezo electric whistle(90dB at 12v) powered by my 4s lipos and turned on by a servo with a limit switch on it!
keep watching for my horn system v2, which is going to have an air horn in place of the buzzer!