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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Intakes are different as well
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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.