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

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Old 03-05-2012, 01:44 PM   #1
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What are PI's and NPI??

I need to know the basics about them..
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Old 03-05-2012, 01:50 PM   #2
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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
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Old 03-05-2012, 05:10 PM   #3
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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
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Old 03-06-2012, 03:45 AM   #4
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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.

http://www.sullivanperformance.com/yvs450/tech/tech.htm
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