Competitions departments quickly changed the less than competitive layout of the head, with crossflow versions developed by a number of tuners such as Steinmetz, Mantzel, and Irmscher.
Opel | Opel Corsa | Opel Senator | Opel Astra | Musical tuning | Fritz von Opel | Francis Steinmetz | Steinmetz | Opel Blitz | Opel Ascona | Opel Admiral | Jürgen Steinmetz | Engine tuning | Charles Proteus Steinmetz | William Tuning | William G. Steinmetz | Pythagorean tuning | Opel RAK.1 (plane) | Opel Kadett B | Opel Combo | Steinmetz Opel Tuning | Sol Steinmetz | Schuler tuning | Richter tuning | Opel Tigra | Opel's | Opel Rekord | Opel Manta | Opel Insignia | Opel GT |