Is a Tune Necessary?

Zuko_the_Z

Hey everyone. I am new to the forum. I've been a 370 owner for just over a year. Actually it is the car I bought my wife. I however also treat it as my weekend car (its a roadster). Here is the dilemma I am facing. I started hearing a ticking sound when I first start the car. As it warms it goes away. This was determined to be an exhaust leak. I took it to an exhaust shop and they told me my exhaust manifold is cracked. Well that massively sucks but at least it gives me an excuse to upgrade. Before I ask this question the only modification that has been done is a custom magnaflow exhaust. I called Z1 motorsports as they seem to have the best headers on the market. I found they only connect to a test pipe or high flow cat which I just want to stick with my OEM for now. I then found the DC Sports header which supposedly is a direct swap. Here is my question... I do not want to tune this car. At least not in the near future. If I were to get these DC Sports headers just to replace my cracked manifold. Would I be required to have a tune? What I mean by required is if I opt out of a tune with headers and exhaust would I damage the engine? Thanks for the help! sorry for the long nature of the question. Just wanted to give some background.