Pi question
01-14-2007, 07:24 PM
#2
3rd Gear Member
Join Date: Jul 2006
Location: Texas
Posts: 721
RE: Pi question
PI is talking about the heads on the new edge (99-04) mustangs. Ford made a lot of improvement in airflow on the 99-04 heads, so they named them performance improved (PI) heads. To go along with this the new edge motors got an upgraded cam and a more aggressive tune. Thats where the 40 HP difference over the earlier 4.6's came from.
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