the exhaust from Eisenmann, Remus, AC Schnitzer, etc. come with a so-called ABE (Allgemeine Betriebserlaubnis - meaning General Usage Permission) in Germany - that is an official document that allows their use in everyday traffic. In Germany installing any parts that have such a document doesn't void the warranty. So if that is any indication, wouldn't it be reasonable to assume that BMWNA would follow the same rules?
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