It does sound like the catalytic converter. Try removing the oxygen sensor between the engine and the converter to see if it runs any better. If it does, replace the converter.
Take a look at this link and try what it suggests.
Let me know what you find. Also, if the new pipe indicates a direct fit, it should work fine. Just make sure the bend on the original one isn't there to prevent hitting something.
Let me know what you find or if you have other questions.
Monday, May 15th, 2023 AT 8:17 PM