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I'm trying to find a plug for this hole on my manifold and I can't figure out what thread type it is. Also, does anyone know what thread type the EGR exhaust line is? I think it's the same as this hole. Some metric pipe thread?

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Good one, G.      Not only would that work, but would be a great conversation piece.  Make sure it is NGK.

Subaru's new 5-cyl.

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+1 on spark plug. You might wanna bust the ceramic in a safe work practice and weld the hole up. Or get another coil and lead :)

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I just left the thermosesnsor in there. You could try to take the thing to Fittings inc. to find a plug to match. They would have something I bet.

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It's not m14. I can make something work but I want something that looks clean and proper. This is my 4th weber swap and I don't like jimmy rigging things like I have in the past. Before, I would cut the thermo sensor flush and put it back in and I would also cut the EGR line and fill both of the fittings with high temp silicone and use those as plugs but even though all of those meathods work great I want it to look profesional. I plan on doing many more builds in the future so I am trying to streamline the whole process and work out all of the kinks that people usually just "work around". Once I find permanent solutions to all of these little problems I plan on making a step by step guide. Thanks for the input! 

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Try Fittings Inc. They will have it, though you might have to bring your manifold in. They are is the Sodo district in Seattle on 6th ave S.

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