206 HDI CATALYST CLEANING PROBLEM

The friends recently went to the industry because of the low traction, the master catalyst said that the new one should be cleaned, it was too expensive, I said, let me clean it, but now the fuel has increased, the traction has increased, but there is no trace of the old saving 206 image. What should I do? yardimmmm

?

My teacher needs a new catalyst, when it comes to cleaning the catalyst, they completely empty the material inside the catalyst and it is like an empty sleeve, some cancel it and connect a straight pipe, as you said, the car becomes more serial but increases fuel.

Is there any way to reduce this fuel? I couldn't get it because the new one is very expensive