Quote Originally Posted by FordMan77 View Post
The defrost setting will also run the compressor to remove humidity IIRC. Just a thought. As long as the AC compressor pulley is turning with no AC/defrost on then it should be ok.

Do you have an ECM tune to run without the cat converter? If not it's going to run weird since the ECM can't monitor it correctly. You need a cat in there with the downstream O2 sensor.
no but i have been straight piped since 2018 with no problems or issues. Mechanic cancled on me and gotta wait til next week to do radiator now but ill post asap once it gets swapped.