Wie wäre es wenn du das ganze nochmal auf Englisch schreibst. Sollte deine ganze Abgasanlage Serie sein, dann tausch erstmal die Abgasanlage
DeepL scheint gut zu funktionieren, aber okay.
Da haben wir's: I'm a little confused.
The change I would like to make is to mount an empty downpipe (without catalyst) and on the central part a 200 cell catalyst and a smaller than the original one that is huge and you can not leave it together with the 200 cells from what they told me.
Or I could simply change the original downpipe with a downpipe with 200 cells integrated without changing anything else, plug & play, but if the sound remains the same and the horses change little I don't like it very much.
I'd love to hear the whistle of the turbine when I change gear!!!