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Message: <blockquote data-quote="Adam" data-source="post: 94497" data-attributes="member: 8249">You guys still arguing about this? lol. You aren't going to get 65rwho with just a PI swap. Unless your 1st dyno was 100 degrees and your after dyno was -20 outside. I picked up 72 rwhp by doing a PI head/intake swap, but I also put in VT cams, and FRPP shorties. And for all you guys saying to go with a blower because its the same money are crazy. A blower is $4000 minimum, then another $4000 for a new motor when you obliterate your stock one. These motors were only designed to handle about 1000psi of cylinder pressure. A blown car produces about 2.65psi of cylinder pressure per hp. A typical blown 4.6 makes around 400hp(or more, i am being very liberal here) actually around 460hp (the blower takes hp to run also) so take 460x2.65=1219psi of cylinder pressure. The best tune in the world is not going to matter, the engine components simply were not engineered to handle that kind of cylinder pressure....period. It is not a matter of IF the motor will let go, it is WHEN, this is fact, not internet rumor. Hope this helps some people.Adam <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>