Catalytic Convector

Friends, the vehicle's exhaust inspection has not passed. They asked me to look at the catalytic convector. They said to the master that a new floor would be fixed to 300 liras. He said he would go through the examination. I bought the car, took it to the familiar exhausters, replaced the catalytic convector with the original for 850 liras + a new exhaust. I'll take it to the inspection again and have a look at the bidet fuel system. Do you think I did it well or did your comments like a familiar fellow citizen in foreign language?

Well, I think there was an unnecessary process.

If you say you are catalytic in my car, I respect nature, I don't want to harm, you did well. If you say that it will disappear, you would go to a place that gives another exhaust emission stamp, and you wouldn't spend so much.

Either inexperience. It happened once. But the sound of the car has improved