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Message: <blockquote data-quote="07GtS197" data-source="post: 1435806" data-attributes="member: 20715">Im sure they’d be ok with npi heads but the effort isnt worth it imo. Theyre still going to need to be rtv’d and carefully installed to prevent coolant from getting into the intake ports like a pi intake swap but you will likely gain nothing. The plenum volume is puny when compared to a pi intake. Ive never seen one next to an npi intake so take this with a grain of salt but Id imagine the dorman is probably about the same. So in essence you would be swapping to an intake with the same plenum volume but misaligned intake ports so you gain nothing and have to do extra work to make it fit. Not worth it.Unless the dorman you found is for npi heads but then I would still skip it.</blockquote>