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Belt for Twin IGN Distributor. A design fault on engines up to August 1993 that you MUST fix if not already done so is to add ventilation to the distributor to prevent ozone perishing the distributor drive belt. If this breaks you will be running on one plug per cylinder and will end up with poor performance and possible damage.The solutions is to also fit a Venting kit, please see below.Fits:Porsche 964 1990-94