The Aluminium threaded plugs are available , they have a conduit thread. All three S1's i have owned had a pipe thread tapped & pipe plugs fitted. If you go this way you will need to make sure you grind the plug flush or you will brake the rear lug off the manifold . IMAG0995 plug.jpg IMAG0997plug1.jpg IMAG0993 (1)manifold.jpg


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