Been thinking about headers and exhaust. I have seen the green cats that are supposed to eliminate the engine light coming on or any error codes.
But I have seen some reviews where the manufacturer claims the install to be fine, but then the owner of the car will have issues right away with error codes and stuff and no support from the manufacturer....

I don't want to get into having to have the car displaying errors or failing an emissions test either.

What kind of experiences have you had if you are running headers and full exhaust? What are you running? Is it working good?
Is it worth the money and time to change out?

Thanks in advance for any feedback!