New to mustangs

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10-31-2006, 03:31 PM

Firebb15

Thread Starter

Join Date: Oct 2006

Location: Detroit, MI

Posts: 27

New to mustangs

Just bought my first one this summer...96 gt auto. I noticed that 99-up have PI intake and heads. What does PI stand for? Also, will just the PI intake give me a noticable gain? Thanks, Brian

10-31-2006, 03:37 PM

II 98 GT II

4th Gear Member

Join Date: Jul 2006

Location: Michigan

Posts: 1,125

RE: New to mustangs

PI = Performance improved. 99-04's have PI heads/cams/intake. Putting a PI intake onto your car will give you noticeable gains (15hp?). It isn't a direct fit onto the NPI heads, but there are a number of places where you can buy PI intakes with adapter kits meant for NPI heads.

10-31-2006, 08:55 PM

Sxynerd

6th Gear Member

Join Date: Feb 2006

Location: Virginia

Posts: 11,786

RE: New to mustangs

Find a set of PI Romeo heads and an intake. net 60 hp. bump in compression to 10.4:1 and you'll have to run 89+. Cold starts might be a problem if you live in a hell state like michigan!