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Should be same as o2 sensors & I think that's 18mm course thread. Can't imagen why they have 2 bungs. 97-99 Box needs 1. My Fabspeeds don't have any. Maybe they are making 1 part to fit all 986's. Do the mounting flanges have 3 holes or slots for multi-fit? Maybe you got a Cayenne set? I would think they would include hardware to block the bungs if desired.
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