Hi guys i just got a 2003 mustang gt 4.6 how do check kow it the car has pi heads

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i'm familiar with penetration
Mod Dude
Feb 18, 2001
It should have PI heads originally. Do you suspect this motor has been replaced, or the heads have been changed?


SN Certified Technician
Aug 14, 2009
Houston Texas
Your 2003 GT has PI heads unless someone has swapped in a non-PI motor.

It may have a Dorman PI intake.
  • The part numbers on the plastic
  • the bolts that hold the COP into the intake go DIRECTLY into the plastic and resemble wood screws. A real Ford unit will have brass inserts and real machine screws.
  • The Dorman unit will have two ECT bosses on the metal coolant cross over.


Active Member
Jul 2, 2019
Intakes are different as well
Just FYI, these are both NPI intakes; they reversed the runner order when moving to PI (starts with Cyl # 5 instead of Cyl # 1). Some NPI cars got the aluminum crossovers (my 98 had one).
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