They made one prototype of a PI in '03 I think. I've seen the picture floating around online. It's a 32-Valve 4.6 like the Cobra. It's got 2.73's I think. What wheels were on it? The picture I saw had some wider Crown Vic-esque black steel wheels with silver center caps. The car was also wingless.
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I just found the some pictures.
I found some pictures of what looks like a REAL car, not a prototype. The PI badge looks to be under the Ford logo in the back, not in place of the GT badge, and under the GT badge on the sides.
"Police Options"
-Heavy duty battery
-4-225/60/16 size RS-A + the brand new police tire developed for the Crown Victoria
-4 Heavy duty Bilstein shocks
-Engine oil cooler
-Transmission oil cooler