Originally Posted by 98SS

Oh boy, J&S. I personally won't trust it. Of course I don't have one. But there are so many noise that go on in the engine bay, you tell me a little microphone can pick up it all and the processor it has could tell the difference between knock and regular engine sound?
If it runs on the safe side, it would retard timing even when actual knock is not there.
If it runs to produce power, it may not pick up all the knock. To me that tunning is a little scary, like walking a fine line.