X Police motor? I honestly don't think there is a difference.
Install a pair of PI cams and the PI intake manifold. There is plenty of info on this in the search function.
This will bring you up to around 245hp very close to the 99 GT numbers without having to do a full PI head swap.
the next time a state trooper or a local cop passes u take a look at the bottom left of the trunk lid and it will say "police intercepter" suppose to be a little bigger and a good bit stronger than a reg 4.6
Alternator, heavy duty 135-amp maximum
output, 82-amp at idle w/unique drive pulley
for improved charging system
• Axle ratio, rear 3.27:1 with non-locker
differential
• Battery, extra heavy-duty, 78 amp-hr (750
CCA) with heat shield
• Conventional headliner without grab handles
• Cooling Package; Police level, with 8 blade
plastic fan, dual speed electrodrive fan motor
and lower radiator air dam
• Decklid release located on instrument
panel, direct to battery (gasoline fueled
vehicles only)
• Drive shaft, aluminum 3-1/2" heavy-duty
and heavy-duty u-joints (n/a with Natural
Gas Vehicles)
• Engine, gasoline, 4.6L overhead cam, SEFI
V8, unique with Police Pursuit calibration
including increased idle speed for improved
charging system output and cooling
• Increased horsepower, to 235 @4750 RPM
and torque, to 275 Lbs/Ft @ 4000 RPM
• Engine oil cooler
• Personal safety system – includes safety belt
pretensioners, front dual stage air bags and
seat position sensors
• Power steering gear, heavy duty, unique, for
improved road feel, with front-mounted oil
cooler, without speed sensitive variable assist
• Front seats, cloth bucket – manual reclining
with anti-stab plate driver/passenger, with
power lumbar on driver’s side and weapons
cut-outs
• Suspension, police, heavy duty front and rear
springs, shock absorbers and stabilizer bars
• Tires, P225/60R16-97V Goodyear BSW, allseason
speed rated with conventional spare
• Transmission oil cooler, external, front
mounted
• Wiring, courtesy lamp
• Accessory feed wires, police:
· One ignition feed (3 connectors, 30-amp fuse)
· One direct feed (3 connectors, 50-amp fuse)
The Police Interceptor Motor is basicilly the same as a Crown Vic motor with a different tune and alternator. Be careful with a motor out of Crown Vic, they didn't get the PI version until 2001 or 2002.