His campaigns racing the BMW 3.0 CSL "Batmobile" were very successful in 1974 and 1975, in the German DRM as well as in the USA together with Ronnie Peterson.
As súas campañas de carreiras no BMW 3.0 CSL "Batmobile" tiveron moito éxito en 1974 e 1975, no DRM alemán, así como nos EE.UU., xunto con Ronnie Peterson.