I drive a 94 5.0, but I try to learn stuff about the 4.6 cars on the side - I've been reading alot of treads and I've noticed P.I. being mentioned alot - like P.I. heads, etc. Problem is I have no idea what that is. Could someone tell me? Sorry for the noob question but the modular cars arent my thing really.

 

When ford first introduced the modular cars, the 96-98 model gt's came with 215-225 horsepower. The power was low because of restricting heads/intake/cams. The newer mustant gts (99-04) had the heads intake and cams redesigned for more power. They changed the small teardrop shaped ports in the older cars(96-98) to better higher flowing rectangular ports in the 99-04 gts, thus labeling the 99-04 heads and intakes Perfomance Improvement (P.I.)

The reason you hear people talking about PI parts all the time is because it is a very popular swap for those of use who own 96-98 gts. The head and intake combination has yielded gains of up to 40+ RWHP untuned. It's a very easy way to bring out the power in our older gt's, and make them competition for the newer gt's.

 

Yeah I had picked up that the 96-98s were slower and had less power but I wasnt sure why. Thanks for the info.

 

plastic intake

 

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LOL - plastic intake