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1986 951 Exhaust headers

Engine

Model: 951, Year:1986, Mileage:53,400, Type of use:Street use only
Was there more than one updated 2-3 exhaust manifolds made. My car has the heat shielded manifolds but the 1-4 does not have the updated "bellow" insert. I purchased a used 2-3 but my mechanic said it was the defective type (something to do with a smaller flange?). I thought that the cast pipes were the defective ones. What do I look for?

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