Hi. New here. I just got a 2001 R/T with 81k miles. Had a bad 02 sensor but replaced it. I have been getting a small exhaust smell in the car but now its a lot worse. I figured it was a cracked manifold or blown gasket but after inspection, I believe its the flex piping right in front of the Cat. Has anyone ever had this fail? Is there a simple fix other than buying a new catylitic assembly with new flex piping or get a new header and weld it in?