Dealer kit 000.043.202.52 & Porsche Technical Service Bulletin (TSB). The sparks made under the rotor cap create ozone that attacks the dual distributor's internal rubber belt. The added hose kit moves just enough air through the distributor housing to keep the ozone level down.
In the metal side of the primary distributor is an oblong hole that may or may not have a plastic plug seal in it. To install pry the plug seal out and snap the hose adapter into the hole then attach the hose to it. The other end of the hose attaches to a nipple in the heater ductwork leading from the engine compartment blower.
This modification should be present on the later 993.
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