Genuine OEM part.
This is a special OEM nut designed to withstand the extreme heat and heat cycling of a turbocharged exhaust. It has a special locking design to ensure it does not come loose with repeated heat cycling and vibrations. This is a 12mm nut used to fasten the downpipe flange to the O2 housing outlet studs (MD089315).
Specs: M12x1.25, peened lock nut.
Sold individually.
Applications:
DSM (1990-99).
EVO (I-III).
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