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Exhaust manifold plug size where EGR used to go?

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I got a non-EGR intake manifold installed and I now have a large hole in the side of the exhaust manifold that the EGR used to run to. I was wondering if anyone knew what size bolt or plug I can get to plug that exhaust manifold up with? Or should I just buy an aftermarket header?

IIRC it's a british pipe thread. not 100% sure though. your best bet is to find one slightly larger and tap it.

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