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Message: <blockquote data-quote="Dalamar" data-source="post: 3278" data-attributes="member: 8116">PI - is the name ford gave them, stands for Power ImprovedIn 99 the changed to heads with bigger ports, and a little better cams.The intake manifold also has bigger runners.The swap usually consists of the assembled head/cams, intake manifold, gaskets, and head changing kit.Stock swap, you're good for about 45 rwhp.I did ported heads, and cams, & tune - and gained 95 rwhp.They are the place to start for serious power gains, the headports on the stock 96-98 are too small.At about 5500 rpm it falls on it's face. If you add a blower, you're airflow is limited by that specifically.It also depends on how much power you want to get from your car, and how much money you want to put into mods <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />there's some pics of my swap in my member ride thread - DalamarLet us know if you have any questions.</blockquote>