Been doing some searches on it, but there's a lot of conflicting descriptions, so, which is it? Looking at picking up a cheap '85 300D that has the CA emmision set-up, and I know trap oxidizer is bad, and trap catalyst won't do the horsepower any favors, but at least isn't sending destructive particles into the turbo. So, how to tell them apart? Thanks in advance...

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'84 300SD veg-oil bliss
'83 300SD veg-oil beater