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If you are pulling a TT and have a cap on our truck and you locate it all the way to the back of the cap it may work some. If you are pulling a 5ver they will make no difference because they can't move the air high enough or wide enough to make any difference, they do move the bug line up the front cap. Most of the newer 5vers have more aerodynamic front caps to help move the air up and over. If you want to buy one don't buy a new one there are a lot of used ones out there because they don't work. I used one for a few years and it made no difference in mileage but it did move the bug line up higher on the rig.
Denny
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2000 F350 Lariat SC DRW V10 4.30 Gears BrakeSmart
Air Lifts 4X2
2003 HH Premier 35 FKTG
BSEG started 4/15/2000
Avon Park Fl for the winter 09-10
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