Some more informations, with a shortcutted translation of the attached article
..Once I had an engine from August Stawicki in my Gepard Group 6 NSU with wing doors. The NSU Gepard was built in Bonn by aircraft designer Kretschmann, Stawicki drove the open version of it. He was the world champion in lightening NSU clutches, rocker arms, etc., very thin grounded and razor-sharp. Somewhere I must still have a typewritten brochure about his NSU mufflers. A bright-sounding steel pipe, modelled to fit the stock exhaust manifold…. Stawicki was one of the first to took part in the 500km Nürburgring races in the 60s with an special NSU Sport-Prinz, forced by a doubled NSU-Max motorcycle engine in its engine bay.Together with the other Prinz-drivers Hans Menzel, Roland Heck, etc., he took many class wins there. August Stawicki, the fearless NSU driver from Rhineland..