How do you know it "still doesn't knock"?? - Saab Performance Bulletin Board - Saabnet.com
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As lms stated, the APC microphone is tuned to detect pre-ig or detonation at frequencies that you can't hear. As stated at the Saabsite:
"The damaging effect is out of the frequency of human hearing"
Be careful, or you won't make it down the strip, much less in front of the '87 Vette!
Jonathan
Link to Saabsite's APC page
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