PI?
PI=Performance Improvement, usually when people say PI they are talking about the Heads. Pretty much the HP difference in the 96-98 GT's and the 99-04 GT's, along with the manifold.
96-98 GT's have NPI Heads, and the 99-04 GT's have PI heads.
P.S. Gotta search these kinda things[8D], its probably come up 1000000 times, just an fyi so someone doesnt bite your head off for asking before searching.
96-98 GT's have NPI Heads, and the 99-04 GT's have PI heads.
P.S. Gotta search these kinda things[8D], its probably come up 1000000 times, just an fyi so someone doesnt bite your head off for asking before searching.



If you read the post above me I'm sure you'll understand...