please tell me about pi

[tcorns]

i see alot of reference to the term pi and the mod motors. i am curious as to what it is and if my 03 gt vert has it. also any good reccomendations for an h or x pipe and a cat back exhaust. not looking to be annoying on sound just want to sound healthy. so many different ones out there and i have heard so many sound clips. kinda thinking about the jegs kit. store is close to home and i kind of like the sound, not to mention the sound of the price. any thoughts?

thanks
trev

[cstreu1026]

PI refers to the power inproved or performance improved cylinder head and intake design that cam on on 4.6L 2 valve Mustang from 1999 to 2004. the heads can also be found on other mod motor powered vehicles such as f150's and crown vics but I am not sure what year they all switched.

[MADMOD]

PI refers to the power inproved or performance improved cylinder head and intake design that cam on on 4.6L 2 valve Mustang from 1999 to 2004. the heads can also be found on other mod motor powered vehicles such as f150's and crown vics but I am not sure what year they all switched.

I think they switched in 99 also.:confused:

[Foxxx5oh]

I think they switched in 99 also.:confused:

you are correct sir,

pulled from wikipedia

A redesigned model came in 1999. Gone were many of the soft lines of the previous model, but the car still rode on the SN-95 platform. The Mustang GT's power increased to 260 hp (194 kW) at 5250 rpm and 302 ft·lbf (409 N•m) of torque at 4000 rpm via the new "Power Improved" (PI) heads, cams, and intake manifold. The new 16-valve SOHC 4.6 L engine exhibited characteristics associated with a performance engine when compared to the performance behavior of earlier 4.6 L engines.

[tcorns]

thanks for the information. is there a reccomended performance upgrade for the intake?
thanks

trev

[cstreu1026]

I think they switched in 99 also.:confused:

I know Crown Vic's didn't get the PI heads until 2001, but I think they were about the last the get them.

[bobtsgt]

P51 or bullet are nice upgrades for the PI heads

[Walter]

dont forget about this one.