What you should have done is leave the old sensors in for a couple of hundred k's, Then put the new one's in, As the coating of the new headers an cats will burn off in the first couple of hundred k's an contaminate the sensors. So it is possiable that the sensors are already ####ed an you may need new 1's.
Take it easy...But do take it...
Do not argue with an IDIOT.
He will just drag you down to his level an beat you with experience.
Some people take me the wrong way, Like smacking up Marijunna.