well you get the same performance from any one of the mufflers as their all straight through versus the chambered you have now. I have no resonators on my truck with the 22" muffler and you can tell its a little louder, but not by much. I don't know how much performance you'd get because its just a muffler, if you want more performance get a CAI as well!
Painted headlights probably aren't as cool as it sounds haha its just black painted housing, you've probably seen it before but i didn't know what to call it
i just painted the chrome housing inside, costs $25!