Zak-E23/75 Initially built by Zakspeed as a Gp.2 car in Castrol livery for Hans Heyer, who went on to win the 1975 championship. Then to Europa/Mobel livery for 1976 and driven by Klaus Ludwig, who placed second to Heyer in the Gp.2 category. Gp. 5 was introduced as a new category for the DRM in 1977, and Zak E23/75 was converted to Gp.5 specifications for the 1977 championship. The modifications included much wider bodywork and wheels, as well as more freedom on engine modifications, suspensi