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Buy the Ford/Donaldson AIS system. Unless your truck is an over 400 HP beast, the AIS has more than enough flow and is 99.97% efficient. I researched this extensively last month before I purchased my AIS (my stock lid started to warp from heat and age). The kit you need is Motorcraft FA-1759 or Donaldson X007953 (they are the same thing as Donaldson makes the filter and developed the system, but the Motorcraft part number will be easier to find). I paid $179 total to the door. Takes less than 30 minutes to install. A plus is that you service the filter by the restriction gauge and most people change for piece of mind as the filter will literally last years before restriction is too high.
2001 F-250 4X4 CC SB 7.3, 4R100 3.73, BFGoodrich All-Terrain TA, Motorcraft filters, Mile Marker manual hub locks w/ESOF (No hub "floating"), AIH delete, Rust-Oleum bed coating, Silverstar headlamps and 5000K LED lamp replacement interior, clear headlight assembly, Moog greaseable u-joints, Moog greaseable ball-joints, Moog front hub assemblies, retractable hitch in bed, original black CPS (BEST "mod" to have), Energy Suspension bushings, Red ELC, Edge Evolution, Walker BTM, Donaldson AIS
Last edited by 01f25073; 03-12-2013 at 12:55 PM.