What are PI's and NPI?? - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT

Join Mustang Evolution Today

Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 03-05-2012, 01:44 PM   #1
Registered Member
SwatKatz901's Avatar
Join Date: Jan 2012
Region: Tennessee
Posts: 215
What are PI's and NPI??

I need to know the basics about them..

SwatKatz901 is offline   Reply With Quote
Old 03-05-2012, 01:50 PM   #2
Registered Member
CodyNelson's Avatar
Join Date: Apr 2011
Region: West Virgina
Posts: 1,204
Re: What are PI's and NPI??

Non PI (performance improved) heads came on the first generation of the 4.6 motor from 96-98. In 99 Ford changed some of the designs of the engine and introduced the PI heads/intake manifold. These heads have a slightly altered combustion chamber and have improved flow numbers thus increasing horsepower. The PI motors are in all GTs made from 1999-2004

CodyNelson is offline   Reply With Quote
Old 03-05-2012, 05:10 PM   #3
Registered Member
mhobbs's Avatar
Join Date: Mar 2011
Location: camp lejuene
Region: North Carolina
Posts: 113
Re: What are PI's and NPI??

PI's have improved compression. npi stock have 215 hp pi have 260 hp. I think thats at flywheel not rear wheels
mhobbs is offline   Reply With Quote
Old 03-06-2012, 03:45 AM   #4
Road Trip!
Join Date: Feb 2012
Region: North Dakota
Posts: 303
Re: What are PI's and NPI??

Here's a good article to check out that gets a little more into the differences in heads and engines and stuff. Very good info on the NPI vs. PI heads.

K Twisted is offline   Reply With Quote

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
What made you smile today...? deadsp0t The Bar 12160 Yesterday 04:07 AM
What did you do today? Qwik Four Six The Bar 20437 10-15-2016 05:19 PM
Waxed and clayed, shiney! Project Pony Pre-2005 V6 Mustang 31 03-08-2012 08:44 AM
Clayed and waxed! Project Pony Mustang Paint, Appearance & Detailing 8 03-05-2012 05:33 PM
Npi or pi?? port or buy new heads mhobbs 1996-2004 Mustang GT 33 03-05-2012 01:07 PM

» Like Us On Facebook

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

10:25 AM

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.