After checking realoem, it seems that 4.6 and 4.4 have the same exhaust manifolds. The cat for cyl 1-4 have matching numbers between 4.6 and 4.4. But on the driver side the numbers doesnt match?!? But in my opinion it got to be a match there to. I cant find any logical reason why the 4.6 would have a different type of cat on cyl 5-8


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