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The Classic Retrofit 6-pin CDI+ ignition unit is a direct replacement for Bosch CDI spark boxes fitted to classic Porsche 911 SC models from 1978 to 1983 on the SC and 930/911 Turbo to 1989. Extensive development and rigorous dyno testing has proven our CDI+ unit to be a major improvement over the original Bosch CDI, with improved torque right across the rev range.