[Dynamical]

I have a question for people who know bout this and it would also add into the decision of installing your own headers or not.

I have read here on the forum if you install your own headers, you will end up with permanent codes and that even taking the car for a tune, the tuner can't get rid of? So because of this reason, headers should be installed at the tuners shop so you don't end up with permanent codes? You guys who know, is this correct or incorrect?