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Here’s a comparison of the two intake manifolds. The stock intake (right) can flow approximately 150 cfm of air through its upper/lower runners. We found data that shows a well-ported OEM 5.0 intake can flow 200 cfm. To give you an example of the stock-to-Explorer-intake difference prior to porting, an Explorer intake set flows 200 cfm. However, with port work, the manifold’s airflow increases to 240-250 cfm. Physically, the key difference between both manifolds is their runner length and port layout. The 5.0 H.O Mustang intake has shorter runners and inline ports in the lower manifold. Conversely, the Explorer’s upper runners are just slightly longer and the lower ports are offset.