PI Heads stands for Power Improvement Heads. The PI heads went on the Mustang in 1999 and represented a 40 hp improvement over the 96-98.
Apparently, in your car, these heads did not go on that model until 2001 (not according to me, but based on the earlier post)
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Black 2000 GT Vert: Novi-2000 with Intercooler (375rwhp @ 9 psi); Tune by Kauffmans; Roush 380R Body kit; Steeda Subframes; Steeda Strut Tower Support; Deep Dish Bullets; FRPP 4:10's; SCT 4 Position Chip with four custom tunes; Steeda CAI; C&L Pleum; BBK 75 TB; SLP Loudmouth; SLP Catted X-Pipe; Bullitt Suspension; UPR Conrol Arms; Focus Fuel Pump
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