The 04 Police Interceptor is rated at 239 HP/287 ft-lbs. 99-04 GT's are rated at 260 HP/302 ft-lbs. The upper intake (aka "upper plenum") is of a completely different design as well. The discrepancy in power, however; is related to the Vic's inferior exhaust as well as a completely different PCM calibration. Heads, block, pistons, crank, and rods are the same though. So in other words, if you have a line on one, get it. It will be cheaper than an engine out of a GT.
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