NPI= Non Performance Improved heads <---(PI)
PI= Performance Improved heads
non NPI='s who the heck knows.
the 96-98 mustang gt's had NPI heads and intakes these flow alot less than PI heads and make the motor have crappy power. 99+ GT's have PI heads. these flow alot more air and thus gave the big HP jump rom 98 to 99 modles. same thing for intakes they are different for NPI and PI cars. you have to use the same intake with the same heads. But there are adaptor plates out that let you use the PI intake on non pi headed motors.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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