I wonder if it was a diesel oxidation catalyst. I believe the early '90s "ecodiesel" VW Jettas had those here, and of course nowadays they are on all diesels. Seems like around this era may have been when they first began trying to use them.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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