I know as of last month w/ my TCCoA club discount, I can get the heads for $570. It would be worth paying the $40 joining fee to save an extra $90-100 if the price is still the same.
PI just stands for "power improved." Thats what Ford called the 99+ 4.6 heads. They will add at least 35+HP, more if you put some P&P work into them of course.
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2001 SVT Lightning (red): Many mods to come- Let the Vette killer begin to take shape
1997 Thunderbird 4.6L: Dynomax exhaust, Mustang intake tube, SVT Lightning 80mm MAF, Accufab MAF adapter, 7" Auto-physics powerstack filter, ram air, B&M 24,000GVW trans cooler, Custom chip, FMS 9mm wires, many more to come...
No Longer own: 91 LX 5.0L 5 spd
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