Lith ium

So... I found this today.



And Im not about to pay for an oem 🐱 /header replacement. And I dont need a cat at all where I live. Im sure I can figure out how to trick my computer with the o2 sensors. Was planning on just getting a DC header or whatever. Question is though-
My muffler is deleted already. This plan going to result in a fartcan sounding exhaust? If so, I just need to take it to an exhaust shop and have them install new header while installing an aftermarket cat. Cause it sounds perfect right now and I dont want to mess it up. I dont know how much the cat affects sound, so... Yeah, do these engines sound at all reasonable basically straight piped? Or is there a resonator down there somewhere?