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First off this is a Mustang forum, not a Navigator forum. Not to sound like a dick, but the Navigator is not a performance vehicle, its a large, luxury SUV. Now yes, in general the 5.4 has a decent amount of bolt on performance parts, but nothing that will really "wake it up," besides a SC. I have a K&N filter in my F-150 w/ a 5.4L and I never really noticed a thing. I only bought cause it helps to free airflow over the restrictive OEM filters as well as helping to increase gas mileage.
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92 Mustang GT, 347 Stroker(Forged Steel Crank/Rods-Balanced, Forged Alum Dished Pistons), B50 Block, Track Heat Intake, Twisted Wedge Heads w/ Stage 3 port/polish, 80mm C&L MAF, FMS 30# Inj., BBK AFPR, Trick Flow Stage 2 Cam, Trick Flow 1.6R Rockers, BBK EL-CC Headers, MAC O.R. H-Pipe, Flowmaster Cat-Back, Accufab 75mm TB, MAC CAI, BBK Pulleys, Griffin Alum Radiator, Mark 8 Fan, MSD Pro-Billet Distributor; AOD, Dynamic 3300 L-U Converter, B&M Trans Cooler; 3:73 gears.
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