I am new to this stuff and reading throughout so of the post I seem to see the word "KNOCK" allot, so what does that mean ?

MY U7135 PREDATOR really is not giving my 2007 dodge charger rt 5.7 any snap at all. I have cold air intake, shorty header, performance exhaust, catch can, throttle body spacer and this predator. It is set at CAI 91 and I have put some different settings in it and they don't seem to make any ...