What are these Mufflers and Headers?

Putting an expensive header on that car will make absolutely NO difference in the way it runs whatsoever. Only thing you'll notice is a lightened wallet.
I would fix/replace that crushed tube, and get rid of those cherry bomb mufflers. Replace them with a set of turbo style mufflers, you'll like the sound (and so will the ol lady) and it won't be annoying. I would run the pipes out under the bumper if they aren't already.

My 2 cents.

George