Have a question about the cats. I purchased this car used from a Dealer and now have a code showing oxygen sensor post cat problem. I replaced the sensor and then noticed a crack in the front cat top in the weld. Was going to take it to the chrysler dealer since I saw the 8/80 on the emmisions components. Today I noticed that something didnt look right on my car when I looked up an exhaust replacement just as a backup plan. the owner before me must have removed something. I have attached pictures so please tell me what they removed.