Exaust Manifold Differences
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07-10-2007, 06:54 AM
Join Date: May 2006
Location: Iowa
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Exaust Manifold Differences
Are there any differences in the flow of the exaust on the 4.6l and the 5.4l. Im doing a swap from a 4.6l NPI to a 5.4l PI. And the manifolds on the new 5.4l dont match the down tubes. And i know i can change the down tubes, but i figuerd it would be easier to swap out manifolds. They do look different but the sizes are compareable.