Catalytic converter failure 4.6is

[jontezan]

Originally Posted by jcp240z

The 4.6iS has unequal diameter headers. The drivers side cat tubing is 55mm in diameter while the passenger side is 50mm. The 55mm carries all to the silencer, it necks down at the silencer opening. The 4.4 is 50mm both sides.

I have never heard a definitive reason why, but assume it is to balance pressure drop due more bends and length on the drivers side.

Ok thx for answer. I didnt know that. But that makes sense. Good i ordered a spare from a 4.6. The spare is cut behind the rubbermount in the same lenght as a new replacement from the dealer would be. See if i weld it or if i buy the clamp that is intended for the job. Personally i like welded seams better than clamps


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