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There has been a ton of work done on this. The sheer diversity of howtrailrs are used defeats any "one size fits all" mods.
I do know this: leave your underhood air filters alone. They are the optimum setup.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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