Was wondering if anyone has any insight on this... assuming we have emmisions and need to keep the same CAT on the car before and after headers, will the new headers help or hurt emmissions testing?

I would think that since the eninges making 10-20hp more it would be running more efficiently, would it be correct to assume it helps to reduce the emissions? Or are there other factors to consider (Converter Heat? EGR system? Other?)

 

many factors as far as "clean" but it wont hurt it. ie make it pollute.