I had told myself I wasn't going to do any more performance mods to the car until my warranty was up, but recently I keep thinking I would like to put a header on to compliment my exhaust and intake mods. However, I have a few concerns. One is that the headers I have seen all involve removing the catalytic converter. Are there headers that incoporate the OEM cat? I have to e-check my car here in Ohio every other year. I don't know if the car would pass without the cat on. Also, I have heard that you can actually lose low end on the MC by removing the cat. I have also heard it is illegal to remove the cat. Any comments about these concerns or this mod would be appreciated!