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My guess on this is that the underbody becomes less important to be smooth if you put a lower air dam on the car to make air go around the car instead of forcing it underneath.
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'02 E-350 7.3 Diesel (Work Van)
'91.5 Cummins 4x4 (Old Blue)
'00 Jetta TDI 5spd
'22 Tundra TRD OR
'04 RX330
'05 Tacoma 4x4
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