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 10mm nut used on 7-bolt DSM and all EVO (1-10) exhaust manifold to head studs (MD146938). It is also used on the O2 housing of DSMs (1990-99).
Specs: M10x1.25, peened lock nut.
Sold individually.
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