'PI' supposedly stangs for 'Power Improved'. I think they've got bigger valves, better valve angles and better ports. There are no aftermarket heads yet for mod motors, but you can get some 99+ heads with port work done on them. I believe 99-02 heads are all the same. A few companies do make cams so far - mostly regrinds of stock cams. I think I've seen them from Crower, Sean Hyland Motorsports, Houston Performance, and some others I can't remember right now.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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