question on heads

grimreaper_72

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So I got my 96 Gt a month ago have been pretty busy with work I finally got a chance to work on it a little been doing allot of reading on the forum and I have a question on the heads how do I tell npi from pi heads I'm only asking cause the more I work on the car I wonder how much has been done i have long tube headers with off road x pipe the intake has the aluminum crossover in the front so I don't know if just that has been changed or more thanks for any input
 

03DSGGT

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Im not sure of any outward differences in the heads, but if you pull your intake off you will be able to tell pretty easily:



The head on the left with the rounded port is an NPI, the square port on the right is a PI.
 

96blak54

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Take a mirror and check for the part # on passenger head towards the front above the manifold. Should see either F5-- or XL--
 

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