Originally Posted by ashtonsser 
it works because the knock sensor when sensing any type of noise frequency in its range will put off a voltage. Thats the way it works. It requires no signal feed or any of that to work. If it hits a noise in the range its looking for it puts out a voltage. Wired into the aux you will hear the noise through the speakers in your stereo. It should work as long as the headunit will handle the voltage ranges if you get a heavier knock.
But brilliant idea though. Anything that can transfer a voltage signal into noise.
I wonder what max voltage from a typical sr20 knock sensor is. I bet you could regulate it using a 12v zener diode if it does in fact go higher than 12v.
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