fits  12-17 Softail, Dyna (with pre-2012 exhaust) (NU); Custom applications to reduce 18mm O2 sensor holes to 12mm

Used in custom applications to reduce exhaust sensor thread from 18mm x 1.50 to 12mm x 1.25 so late H-D models, equipped with 12mm O2 sensors, can be used with earlier 18mm sensor style exhaust systems. Note: For 10-16 Touring models an extra extension cable is required, which is available as 578303 bung set & cable extension kit.

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Home > Parts > Exhaust > Exhaust Hardware & Accessories > O2 Sensors, Plugs & Bungs > NAMZ, 18mm to 12mm exhaust sensor bung reducer set