Pro Tuner "Knock Ears" Kit Dual Channel 2014 Spec

THE KNOCK BOX has sensors that fit to the engine block, usually in two widely spaced places to get better
coverage. The engine tuner will advance the timing until best torque output is found, or he can hear a faint
irregular spattering against the background noise of the regular sound of reciprocating engine components in
the headphones. This widely spaced irregular spattering sound is the onset of knock and most un-tuned road
engines will sustain light knock for extended periods without damage.