99 Eddie Bauer 175k miles. 5.4 4x4 4r100. Bought it with 160k miles and a severly knocking engine because previous owner neglected to put oil in it. Got a used 5.4 pi from a 99 f150 that had been totaled with 89k miles. so far ive replaced the plugs, subwoofer, and starter. I thought my new engine was using oil but i discovered the high pressure oil cooler line has a slow leak only when the engine is running. will fix that soon. just chopped off my stock muffler and put on a flowmaster super 44 series tonight, sounds amazing. i noticed there is 4 catalytic converters a resonator and a muffler?! wtf is it just me or does this seem like overkill and restrictive?