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Message: <blockquote data-quote="Ninety8stang" data-source="post: 781798" data-attributes="member: 11976"><p>You can definitely tell the difference with the port shape. NPI intake/heads have an oval port where as the PI intake/heads have a more rectangular port. Also with PI intakes the have a deeper dome that sits in the middle of the valley so if you ever decide to do the PI intake swap with NPI heads you want to make sure that you have the coolant tube that runs down the center or you'll run into clearance issues when your laying the intake down on the heads. Also make sure you silicone the HELL out of the coolant ports on the heads when laying your intake down or you may run into coolant leaks as I did a couple times.</p></blockquote><p></p>