Consultation on electronic injection

Greetings to all:
my vehicle (2.0cc 8v gasoline. Mod 2005, 100m km.), It is throwing smell of escape, much stronger than normal ...
several months ago, I took the catalyst, because it was saturated, and instead a common silencer was placed instead.
The point is that it does relatively not enough that I notice the smell of abnormal combustion, not immediately after stirring the catalyst.
It may be necessary to modify the injection values ​​with the computer due to the removal of the catalyst, or that the Lambda probe is failing for this reason?
The smell feels even outdoors, but no smoke, or steam comes out of the escape; The car works perfectly, although consumption has increased (very slightly).
Of course, thanks for the comments. Greetings to all!

I tell you the catalyst is done so that it requested everything that is left over of fuel and harmful gases for the environment.

If you have a normal removed that smells different.

Now I tell you if your car has 2 Landa probe the one behind is telling the switchboard that there is no good combustion because the catalyst is missing, that can lead to more consumption and worse vehicle performance.
I think there are universal catalysts or caught one of the scrapping that will surely do the car better.