Headers and Tune long term longevity

Hi all Inaugural post, around 6 months ownership now and loving it, best car I’ve owned.

Im thinking of adding uel headers and a tune just to get a little more out, but wondered how this affects the car/engine long term. The last thing I want is to worsen the engine long term.

Can anyone share their experience if they’ve had the tune and how it’s holding up now? Thanks in advance :)