I recently saw a BMW Aftersales document (in German) confirming that the current M Performance Exhaust is discontinued because of European and German emissions regulations.
It's a June 2018 "Kurzinformation" document entitled "BMW M Performance Parts. Einstellung Abgasanlagen ab Produktion 07/2018. Aufgrund aktueller Gesetzgebungen wird das Angebot von Abgasanlagen eingestellt."
Dusted and done. If you're lucky you may still find a current MPE kit in stock somewhere. However, if it got to be backordered at BMW Germany, you'll be very likely toast.
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///M is art ↔ Artemis
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