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TWX: if your 1982 D250 is over 8,500 lbs GVW; it should be non catalyst, they didn't become mandatory on that weight class till 1987.

Cummins: if you go that route; since it's a much newer engine package, the emssions for that should suprecede the specs of your D250.

Worst case scenario: IF you need cats, I'd swap in a 2004+ 5.7L Hemi/AT from a Dodge Ram 1500 and then your D250 would be a '2004' for emssions even with OBD II.
 
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