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Was the air quality in 1998 (a year someone else brought up but certainly pre-ULSD and pre-Tier II) that bad?
I don't seem to remember it being that bad back then and I haven't seen any improvement since Tier II/ULSD.
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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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