I had crazy amounts of knock so I installed the Lt-4 module, and it made a huge SOTP improvement, but when I scanned it it still had 2 to 10 degrees of knock. A few months later I was sick of it, so I did the resistor mod. I now have a knock count of zero(duh), and I have never once heard pinging or knock, even when spraying or at low engine speeds/high loads. 5.0 Mustangs never even had a knock sensor. Just get a good tune and run Premium(93 here in Illinois) and you shouldn't need a KS at all. JMHO