premise: BRABUS GmbH, founded 1977 in Bottrop (Ruhr Area), Germany, is a high-performance aftermarket tuning company which specializes in Mercedes-Benz, Smart, Tesla and Maybach vehicles. Brabus became the largest Mercedes tuner, other than Mercedes-AMG which became a DaimlerChrysler affiliate in the 1990s.
hypothesis: Brabus GmbH was the largest German tuner in the 1990s.
reason: Brabus was the largest Mercedes tuner (other than Mercedes-AMG), however there was nothing said about tuning of all models in general. 