Just as it says. When getting a mail order tune, do they program the PCM for the LT4 KM or does it function properly just by installing it?

 

A special tune is not required for the KM to work properly, its plug and play. The tuner may ask if you have one though.

 

Your knock sensor is a "microphone" that listens to the sound of your engine looking for signs of knock. The LT4 knock module is a filter to adjust what sounds the PCM will consider as knock. As stated above, the LT4 module is not affected by your tuner's programming.