My origional header cracked all the way through sometime this summer. It makes my car sound like a diesel. Anyway... I need to buy a new header but the problem is that my origional header has the cat. attached. Do I really need a cat. on my car, in iowa I have never had to take ommissions tests. If so, what do I do interms of the O2 sensors. There is two sensors, one before the cat. and the other after the cat.

Thanks for all your help.
Anson